Why do teens not need to eat as much from the protein food group

Which of the following is a health risk associated with ground-level ozone? a. cataractsb. skin cancerc. respiratory illnessd. all of the above

Acne is caused by a. a strict diet b. eating at night c. hormones d. dry skin select the best answer from the choices provided. a b c d

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