The presence of gill-like slits in a human embryo is considered to be evidence for the

A. theory that fish and mammals have a common ancestry

B. theory that the first organisms on Earth were
heterotrophs

C. close relationship between fish and mammaliap
reproductive patterns

D. close relationship between humans and annelids

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)