Answer: Layer a is 500 million years old.
Explanation:
Trilobite is a member of the group of extinct arthropods found as fossils and they can be identified by the three-lobed as well as three segmented forms. These were the marine animals. These were appeared initially in the Cambrian Period. They used to live 542 million years ago so the fossils can be estimated to be aged of 500 above years old. These animals used to dominate in the sea area.
which of the following is different between covalent and ironic bonds
Answer: Ionic bonds are electrostatic in nature, resulting from that attraction of positive and negative ions that result from the electron transfer process; charge separation between covalently bonded atoms is less extreme.
Explanation:
Ionic bonds result from transfer of electrons, whereas covalent bonds are formed by sharing. In an ionic bond, one atom essentially donates an electron to stabilize the other atom. In other words, the electron spends most of its time close to the bonded atom. Atoms that participate in an ionic bond have different electronegativity values from each other. A polar bond is formed by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. You can predict an ionic bond will form when two atoms have different electronegativity values and detect an ionic compound by its properties, including a tendency to dissociate into ions in water while In a covalent bond, the atoms are bound by shared electrons. In a true covalent bond, the electronegativity values are the same (e.g., H2, O3), although in practice the electronegativity values just need to be close. If the electron is shared equally between the atoms forming a covalent bond, then the bond is said to be nonpolar. Usually, an electron is more attracted to one atom than to another, forming a polar covalent bond. For example, the atoms in water, H2O, are held together by polar covalent bonds. You can predict a covalent bond will form between two nonmetallic atoms. Also, covalent compounds may dissolve in water, but don't dissociate into ions.
What is the blood flow of the antrial systole?
Why do we have different cells in our bodies if every cell has the same DNA?
A. Gene expression
B. Protein synthesis
C. Meiosis
D. Mitosis
Answer:
A. Gene expression
Explanation:
Every cell has the same DNA, but because of gene expression, we have different cells in our bodies.
Gene expression turns specific genes on and off, which makes each cell have a unique function with differences in things such as protein types.
Gene expression also leads to different cells in our bodies because it changes the function of certain cells.
For example, red blood cells and white blood cells have different functions because of different gene expressions.
So, A is correct.
Due to gene expression one have different cells in the bodies.
What is gene expression?It refers to the process by which a gene gets turned on within a cell to produce proteins and RNA. Each cell in the body possesses the same DNA, however, it is because of gene expression that one possess distinct cells within the bodies.
As it makes particular genes turn on and off, therefore, each gene exhibit distinct functions with variations in the things like kinds of proteins. The gene expression also results in the formation of distinct kinds of cells due to differences in the functions performed by them.
Like platelets and white blood cells exhibit distinct functions due to distinct gene expressions. Thus, the correct answer is option A, that is, gene expression.
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Construct a scientific explanation based on evidence for the role of photosynthesis and cellular respiration in the cycling of matter and flow of energy into and out of organisms
In the human body, the cardiovascular system works with the respiratory system by:
Producing red blood cells
Transporting oxygen to organs
Providing nutrients to muscles
Controlling the movement of the lungs
Answer:
answer is true
Explanation:
Describe what happens during each event
in interphase:
· First gap:
· Synthesis:
· Second gap:
Answer: There are three stages of interphase: G1 (first gap), S (synthesis of new DNA ), and G2 (second gap).
Cells spend most of their lives in interphase, specifically in the S phase where genetic material must be copied.
The cell grows and carries out biochemical functions, such as protein synthesis, in the G1 phase.
During the S phase, DNA is duplicated into two sister chromatids, and centrosomes, which give rise to the mitotic spindle, are also replicated.
In the G2 phase, energy is replenished, new proteins are synthesized, the cytoskeleton is dismantled, and additional growth occurs.
Explanation:
what are all 7 parts of the eye?
Pupil, Iris, Sclera, Cornea, Lens Retina, Optic Nerve.
I only know those are the main seven sections but if you need to go more in dept I recommend finding some health books! I hope this helps :)
Which of the following are components of modern evolutionary theory?
I. radiocarbon dating
II. population genetics
III. paleontology
IV. proteomes
A. II only
B. I, II, III and IV
C. I and III only
D. II, III, and IV only
E. I, II, and III only
Answer:
one and three only
Explanation:
because population genetics has nothing to do with history of the population and proteomes isn't included
WhAt Enters from food that is digested ?
Answer:
Ok
Explanation:
Digestive systems
These are things that limit the size of the population.
Answer:
where is the question
Explanation:
the atmosphere is mostly made up of the gases __ and __
Answer:
I believe nitrogen. hope that helps
Answer:
Nitrogen and oxygen
Explanation:
More nitrogen than oxygen.
The two types of metabolic reactions are anabolic
and
a.Mesobotic
b.Catabolic
C.Photobolic
d.Lesobolic
Answer:
B option is correct answer.
Explanation:
As we know that there are 2 types of metabolic reactions in which one is anabolic mean 'building up" as in your question anabolic is mentioned but the second type you ask and the answer of your question is the catabolic means" "breaking down"
. Which of these organisms are primary consumers?
Birds, shrimp, worms
Mollusks, shrimp, fish
Mollusks, crab, birds
Mollusks, shrimp, worms
The third row I think
4. Which are supposed to be healthier for humans to consume, saturated fats or unsaturated fats? Hypothesize what the types of bonds in the fats might have to do with this.
Answer: saturated fat is less healthful than unsaturated fat. However, the overall health impact of saturated fat remains controversial.
Explanation: research
In your own words explain why the color of most leaves make a good tool for photosynthesis
Answer:
Chlorophyll absorbs red and blue light from the sunlight that falls on leaves. Therefore, the light reflected by the leaves is diminished in red and blue and appears green.
Explanation:
Which process requires the expenditure of
cellular energy?
A. passive transport
B.
active transport
C. osmosis
D. diffusion
Answer:
D Difusion......
help ...
Active transport requires the expenditure of cellular energy. Therefore option B is correct.
Active transport is a process that requires the expenditure of cellular energy, typically in the form of adenosine triphosphate (ATP).
In active transport, molecules or ions are moved against their concentration gradient, from an area of lower concentration to an area of higher concentration.
This movement against the concentration gradient requires energy to be expended by specific carrier proteins or pumps embedded in the cell membrane.
These pumps actively transport substances across the membrane, maintaining concentration gradients and facilitating the uptake of essential nutrients or the removal of waste products from the cell.
Passive transport, osmosis, and diffusion, on the other hand, do not require energy as they occur spontaneously along concentration gradients.
Therefore option B Active transport is correct.
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which which of the following resources can disappear if it is used too quickly?
Answer:
A. Fossil Fuels
Explanation:
Which of the following are characteristics of prokaryotes? Select all that apply.
Multiple select question.
A)
have multiple organelles
B)
have a chitin cell wall surrounding the cell
C)
genes are contained in the nucleus
D)
genes are contained in the nucleoid
E)
have a polysaccharide capsule surrounding the cell
F)
have no organelles
G)
multicellular organisms
H)
unicellular organisms
Answer:
answe E have a polysaccharide capsules surrounding the cell
The Arizona poppy is a plant that is native to the Southwestern United States. Its orange flower blooms in the summer and the plant is covered in small hairs. It is an important part of an ecosystem because at least 46 different species of insects visit the flower for food. The Arizona poppy has adapted to living in areas that receive less rain, but there are still periods of time that a drought occurs. What part(s) of photosynthesis would the plant not be able to perform if there were no rain? What would be the long-term effects on the plant if the drought continues? Explain your answer.
Answer:
See explanation
Explanation:
There are three main aspects of photosynthesis
(i) Absorption of light energy by chlorophyll.
(ii)Photolysis of water
(iii) combination of water and CO2 to form carbohydrates.
The second and the third aspects of photosynthesis are controlled by the availability of water. Plants absorb water from the soil through their root hairs and it moves up to the leaves by capillary action.
Hence, if there is no rain (drought), the soil will lack water and so does the plant thereby hindering the uptake of water for the second and third stages of photosynthesis.
the Arizona poppy, lie dormant during drought only to germinate, grow, flower, and yield seeds a few weeks after the rains return.
Complete the statements to identify the first two steps of meiosis I.
The first and longest step of meiosis I is called
I.
The second step of meiosis I is called
I.
Answer:
Prophase I
Metaphase I
Explanation:
One of the methods of cell division that results in four daughter cells is called meiosis. These cells have half of the number of chromosomes when compared to the parent cell. The sub-phases are prophase, metaphase, anaphase, and telophase. So the first and longest step is called prophase and the second step is called metaphase.
Answer:Prophase!Metaphase I!
Explanation:PIs make me a BRAINLIEST need award
Which of the following expressions is not a function of mitosis?
a) growth
b) repair of injury
c) replacement of cells
d) production of gametes
3. How is a magnetic field created in an electromagnet?
Explanation:
idkggggggggggggggggg
Describe 2 adaptations that allow humans to be bipedal
Which of these is most likely an enzyme?
A.Amylase
B.Fructose
C.Sucrose
D.Galactose
Answer:
amylase
Explanation:
enzyme have "ase" as their suffix
please answer quickly :)
When will a female exhibit a recessive sex-linked trait?
When will a male exhibit a recessive sex-linked trait?
Answer:
i think when they get touched in there sen·si·tive spot
Explanation:
Mary has a mass of 40 kg and sprints at 1 m/s how much kinetic energy does she have
Answer:
20 joules of kinetic energy.
Explanation:
what are two properties of a good marker and why are good markers important?
Answer:
1. the color shown is the same as the color that it produces 2. the ink doesn't run out frequently
Explanation:
A good marker is determined by a fair price for a good quality .
1. The body has different types of defences against pathogens.
1 antibodies
2 hairs in the nose
3 mucus
4 skin
Which defences help to prevent pathogens reaching the alveol, when
breathing in?
A 1, 2, and 3
B 2, 3, and 4
C 2 and 3 only
D 2 only
1. Are radiolarians zooplankton or phytoplankton?
Answer:
Radiolaria are holoplanktonic protozoa and form part of the zooplankton, they are non-motile (except when flagella-bearing reproductive swarmers are produced) but contain buoyancy enhancing structures; they may be solitary or colonial.
Which of the following statements best describes interphase?
Interphase is made up of the M and C phase and is the portion of the cell cycle where the nucleus divides.
Interphase is made up of the G1, S, and G2 phase and is the portion of the cell cycle where cellular contents are duplicated.
Interphase is made up of the G1, S, G2, M, and C phase and is the portion of the cell cycle where two new daughter cells are formed.
Interphase is made up of the C, G1, S, and G2 phase and is the portion of the cell cycle where the genetic information is exchanged between chromosomes during cell division.
The statement that best describes the interphase of the cell cycle is as follows:
The Interphase is made up of the G1, S, and G2 phases and is the portion of the cell cycle where cellular contents are duplicated.Thus, the correct option for this question is B.
What is the Cell cycle?The cell cycle may be defined as the entire sequence of events happening from the end of one nuclear division to the beginning of the next. The cell cycle can be divided into two phases. They are as follows:
Interphase.M-phase (Division phase).Interphase is the first phase of the cell cycle that is again divided into three sub-phases.
G1 phase: It is the resting phase. This is because no synthesis of DNA occurs in this phase. It is involved in the synthesis of RNA and proteins. S-phase: During this phase, replication of DNA takes place along with histone proteins. So, it is also known as the synthesis phase. G2 phase: This is the second gap phase. In this phase, the synthesis of RNA and proteins continues.Therefore, the correct option for this question is B.
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