1. True or false? An embryo becomes a fetus at seven weeks. 2. True or false? Teratogens can be physical, chemical, and microbial. 3. True or false? All cells in the human body are made of up 23 pairs...

1. True or false? An embryo becomes a fetus at seven weeks.

2. True or false? Teratogens can be physical, chemical, and microbial.

3. True or false? All cells in the human body are made of up 23 pairs of chromosomes: 22 pairs of autosomes and 1 set of sex chromosomes.