I believe he is looking for an allele
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosomes. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
Thin protective membrane in some protozoa
"Humans do not have gills as fish do, but human embryos have gill slits, suggesting humans and fish share a common evolutionary ancestor" is the one among the following that <span>provides the best example of how comparative embryology supports the theory of evolution. The correct option among all the options that are given in the question is option "C". </span>
Living list:
plants (e.g. trees, ferns, mosses)
animals (e.g mammals, birds insects, reptiles, amphibians)
fungi
bacteria
Nonliving things:
rocks
water and rain
sunlight
air
I HOPE THIS HELPED :)
