Ques: Q: There are about 50,000 vertebrate species, and they are placed in how many different classes? Choices: - four - ten - three - nine A:
Ans: nine

Ques: Q: What creates charged regions in a water molecule? Choices: - nonpolar bonds - ionic bonds - noncovalent bonds - polar covalent bonds A:
Ans: polar covalent bonds

Ques: Q: Although vitamins and minerals do not provide what, they are still essential for good health? Choices: - flavor - antioxidants - enzymes - energy A:
Ans: energy

Ques: Q: The maintenance of constant conditions in the body is also known as what? Choices: - consciousness - mononucleosis - hypothesis - homeostasis A:
Ans:
homeostasis