?In the photograph of the zygote fungus Pilobolus, what are the dark "hats" atop of the structures?

Which pair correctly associates a physiological process with the appropriate vitamin?

A) blood clotting â€" vitamin C B) normal vision â€" vitamin A C) synthesis of cell membranes â€" vitamin D D) production of white blood cells â€" vitamin K

Proteins contain twenty different subunits ____

a. that are the carriers of genetic information b. arranged in a double helix attached to DNA c. including thymine, cytosine, guanine, and adenine d. in the form of nucleotides e. in the form of amino acids

Which of the following describes the function of the myelin sheath?

a. insulating axons b. protecting brain tissue c. transmitting chemical signals d. connecting the cerebral hemispheres

There is a range of color in mice from black to brown to gray to white. In a region of white sand there is a black volcanic deposit. The white mice survive better on the white sand and the black mice survive better on the black volcanic deposit. This could be an example of 

A. sexual selection. B. disruptive selection. C. directional selection. D. stabilizing selection.