The sphincter pupillae muscle controls decreasing pupil size in response to brighter light levels. This action protects the eye from potential damage. The process is involuntary and controlled by the autonomic nervous system.
The pupil size in our eyes is controlled by two muscles: the sphincter pupillae and the dilator pupillae. When we are exposed to brighter light levels, the sphincter pupillae muscle contracts, which causes the pupil to decrease in size. This acts as a protective mechanism to prevent too much light from entering the eye and possibly causing damage.
The functioning of these muscles are involuntary and controlled by the autonomic nervous system. In contrast, in lower light levels, the dilator pupillae muscle would contract to increase pupil size and allow more light in for improved vision.
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Natural selection has been the process that allows organisms to adapt to changes. Heritable variations for some traits are required for natural selection. Thus, option A is correct.
Natural selection has been defined as the process of survival and reproduction that are evident in evolution and are characteristic of a population or generation of the species.
For natural selection to occur variations, existence and inheritance are the major requirements that are crucial for the organism to show the adaptation and evolutionary process.
Traits inherited from the previous generation must show some variation so as to make the current generation more beneficial and selectable over the ancestral generation.
Therefore, option A. the heritable variations of some traits are an important factor for natural selection.
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Your question is incomplete, but most probably your options were,
Answer:
1. heritable variations for some traits
Explanation:
Assuming the options are:
there are four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
a. All the proteins the cell creates from the miscopied strand will do different jobs than the old ones.
b. The miscopied DNA will be replaced with an accurate DNA copy once the cell divides.
c. Both new DNA strands will end up together in a new cell, and the inaccurate one will be discarded.
d. The cell that receives the miscopied DNA will die, and the cell with the accurate copy will live.
When a base is skipped during DNA replication, it can lead to a mutation and altered protein function.
When a base in one of the DNA strands is skipped during replication, it can lead to a mutation in the DNA sequence. This means that the resulting protein created from the miscopied DNA strand may have a different structure and function compared to the original protein. Therefore, option a. All the proteins the cell creates from the miscopied strand will do different jobs than the old ones, is the most likely result of this error.
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living organisms?
Answer: the sun
Explanation:
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exhalation.
b.
excretion.
c.
respiration.
d.
none of the above.