Which of the following is true about natural selection?a. Natural selection usually causes a species to change suddenly.
b. Natural selection does not cause a species to change.
c. Natural selection is the only cause of changes in a species.
d. Natural selection usually causes a species to change gradually. please i beg help me 18 points if you help

Answers

Answer 1

Answer: The answer is d. Natural selection usually causes a species to change gradually.

Natural selection is a one of the basic mechanisms of evolution by which species adapt to their environment in order to increase their chance of survival and reproduction. It is the change in the characteristics that lead to survival. In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. So, natural selection will "select" those genotypes that help survival causing gradual change of species.

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If an alien astronomer in a distant galaxy looks at all the galaxies it can see, it will observe that Select one: a. other galaxies are moving away from it. b. half of the galaxies are moving away and half of them are moving toward it. c. other galaxies are stationary. d. other galaxies are moving toward it. Clear my choice
pinworms have smooth bodies bilateral symmetry and complete digestive tracts. what type of animal are they

What happens to the energy that the fox uses for maintaining its body temperature

Answers

It raises the kinetic energy (therefore the temperature) of the air around it. The energy is not lost, but entropy increases.

Hope it helped and good luck ;)

Which of the following statements correctly describes the targeting of proteins to the mitochondrial matrix or the nucleus? A. Proteins targeted to the nucleus are unfolded while being inserted into the nucleus and are refolded within the nucleus. Proteins targeted to the mitochondrial matrix are completely folded into the cytoplasm and remain completed folded when they are transported into the mitochondrial matrix. B. Proteins targeted to the mitochondrial matrix are unfolded while being inserted into the mitochondria and are refolded within the matrix. Proteins targeted to the nucleus are completely folded into the cytoplasm before they are transported to the nucleus. C. Both mitochondrial matrix and nuclear proteins are folded only after they reach their destinations. D. Both mitochondrial matrix and nuclear proteins are co-translationally targeted to their destinations. E. None of these statements are correct.

Answers

Answer:

Explanation:

Final Answer:

Proteins targeted to the mitochondrial matrix are unfolded during transport and refolded within the matrix, while proteins targeted to the nucleus are fully folded in the cytoplasm before nuclear transport. So, The correct statement is B.

Explanation:

Proteins targeted to the mitochondrial matrix are unfolded while being inserted into the mitochondria and are refolded within the matrix. Proteins targeted to the nucleus are completely folded into the cytoplasm before they are transported to the nucleus.

- Proteins targeted to the mitochondrial matrix are indeed unfolded while being inserted into the mitochondria. This unfolding allows them to pass through the mitochondrial membranes. Once inside the mitochondrial matrix, they can be refolded into their functional conformation.

- Proteins targeted to the nucleus are typically completely folded into their functional conformation in the cytoplasm before they are transported to the nucleus. The nuclear pore complex allows folded proteins to pass through while excluding unfolded ones.

So, The correct statement is B.

Learn more about membranes.

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Which of these elements has the lowest standard reduction potential?A. chlorine

B. iron

C. lithium

D. zinc

Answers

Standard reduction potential is the likelihood that a species will be reduced. It is written in the form of a reduction half reaction.
Lithium has the lowest standard reduction potential.

Answer: C. lithium

Explanation:

Standard reduction potential is the tendency for an element to gain electrons or get reduced ,measured at standard conditions i.e. when concentration is 1 M and temperature is 298 K.

It is given by: $E^0_(M^+/M)$

$E^0_([Cl^(2)/2Cl^-])=+1.36V$

$E^0_([Fe^(2+)/Fe])=-0.41V$

$E^0_([Li^(+)/Li])=-3.04V$

$E^0_([Zn^(2+)/Zn])=-0.76V$

Thus lithium has the lowest tendency to accept electrons and thus has lowest standard reduction potential.

Which type of fossil is Gerobatrachus hottoni most likely to be?intermediary
phylogenic
transitional
index

Answers

C. Transitional Fossil refer to the fossils which trains is the intermediary between it's ancestral group and derived descendant group,as a sign of evolutionary process

Answer:

Transitional

Explanation:

A fossil which has traits that are common to its derived descendant group, as well as the ancestral group, is known as the transitional fossil.
Gerobatrachus hottoni is known as the transitional fossil as it has characters that are common to frogs and salamanders and hence, is known to be a transition between the frog and the salamander.
It is to be noted that a transitional fossil is not a connecting link between the ancestor and the descendant.

Small, uncharged substances enter and leave the cell membrane through the process of

Answers

small, uncharged substance enter and leave the cell membrane through the process of : Simple diffusion When a substance enter pass your cell membrane, it will filter up the uneeded substance to be excreted out from your body and letting the one that needed in by leveraging the thickness of the substances concentration

Answer:

Simple diffusion is the process by which some atoms and molecules move directly across the cell membrane from an area of high concentration to an area of low concentration.

Diffusion of water across a membrane from areas of higher concentration to areas of lower concentration is called

Answers

serch it up might have some answers on there:)

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