Which of the following is a true statement about diffusion?

a. diffusion is only important for animal cells.

b. diffusion requires energy input from the cell.

c. only water can diffuse across a cell membrane.

d. molecules move from areas of high concentration to areas of low concentration.

D is the correct answer, molecules move from areas of high concentration to areas of low concentration

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.