PLEASE HELP Which biological scenario(s) best describes a rigid phenotype for gene expression?

I. Each person has a specific blood type.

II. Red blood cell counts differ in higher altitudes.

III. One identical twin is taller than the other.

a. I only

b. II only

c. II and III only

d. I, II, and III

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what

What two factors does carrying capacity compare? population size and resource use population growth and resource availability resource use and time population size and time