Can anybody help I need 1,2 and 3

How does nitrogen oxides are produced and their air environment impact

What are the components of an effective weight-training program? a. conditioning, progression, generalization, overwork, balance, and recovery b. overload, progression, specificity, regularity, recovery, balance, and variety c. overwork, coordination, motivation, conditioning, regularity, and variety d. consistency, progression, rest, regression, balance, and specificity

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