28. What is a gene? (1 point) A)It is a chromosome.

B)It is an allele

C)It is a pair of alleles that codes for a trait.

D) It is a type of blue, denim pants.

What type of cell division is used to replace old cell?

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.

In which energy level are valence electrons located?