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

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present