Answer:
The correct answer is: A. Only the best-adapted animals in a population survive.
Explanation:
- Natural Selection is the process by which the individuals of a species which has the potential to sustain and survive in adverse or changing environment gets a survival advantage over those individuals which are unable to adapt themselves to altered environmental conditions.
- As the less potent individuals die in altered environmental conditions the adaptable individuals escapes competition with them for natural resources.
- Evolution causes species to alter their characteristics depending upon the demand of the conditions. These changes can vary, can be less or drastic.
- Animals pass all the newly adapted traits to the successive generations either as genetic traits or as acquired traits, as this is necessary for the offspring to survive in the altered environment.
- Natural selection is best defined as "the survival of the fittest".
Given question is incomplete. Complete question has been attached.
Answer:
C. Excessive potassium has diffused out causing hyperpolarization.
Explanation:
The nerve action potential can be divided into following stages:
- Stimulus is detected by the cell in resting stage.
- Sodium channels in the membrane open from where influx of sodium ions occur which is called depolarization
- After a while, sodium channels close and potassium channels open from where efflux of potassium ions occur which is called repolarization.
- The membrane potential further lowers due to continous efflux of potassium ions which is called hyperpolarization.
- After a while potassium channels close and membrane returns to its resting stage.
In the given figure, stage 4 depicts hyperpolarization because the membrane potential has dropped to the lowest point below -70mV. Hence, option C is correct.
The dog's reflection on the water's surface is because of light rays reflecting off the dog and onto the water to create a mirror image.
<span>The point beneath the surface where rock breaks and an earthquake is produced is known as the focus.</span>
Answer:
The first stage is the Interface.
Explanation:
There are primarily two main stages in a cell cycle; but the first stage is the interface. This is a stage in which a cell grows and also replicates its DNA.
It can be said to be the longest phase of the cell cycle. During this phase the cell growth reaches its maximum size, replicates its DNA, prepares for cell division, and also performs it very cellular functions.
This stage has three parts which include: G1, G2 and S phases.
Some cells do not need to divide to exit the cell cycle. These cells can exit the cell cycle permanently. Example is a neurons, they may also exit the cell cycle temporarily. These cells are said to be in G0 which is not a stage of the cell cycle.
