Como les afecta la escases de agua​

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

Which do you focus on to lower your set point

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.