Hidden dangers such as bacteria, viruses, chemicals, and toxic metals lurk in our food and water. Laws help protect our food and water, but consumers can also take charge by making smart choices.
Circulate your way through the heart, blood vessels, and blood. This trio delivers oxygen and nutrients to the body, controls body temperature and hormones, and defends against harmful invaders.
Jellyfish, sea anemones, and corals are members of the stinging cnidarian family. Flatworms, roundworms, and earthworms are three major types of worms.