Answer: when bright light is present, the pupil reduces in size, or flinching when feeling threatened
Explanation: i know what reflexes are :)
Answer:
directional selection, is a mode of negative natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.
The basic number of chromosomes is designated by 2n and is also called somatic number. In normal human karyotype, the somatic number is 46, so 2n = 46. Human karyotype is also composed of 22 autosomes.