Q: What is a common chemical substance on planet earth? Choices: - oxygen - nitrogen - hydrogen - water A:
water

Q: At equilibrium reactants and what are equally abundant? Choices: - results - proactives - minerals - products A:
products

Q: Q: Most of the energy used by living things comes either directly or indirectly from what? Choices: - plants - the moon - the soil - the sun A:
A: the sun

Question: Q: What is the term for protists that produce spores, such as the toxoplasm? Choices: - protozoans - spermatozoa - newborns - sporozoans A:
Answer: sporozoans

*Question*
Q: The pituitary gland is called the "master gland" of what system? Choices: - hormonal - digestive - nervous - endocrine A:
**Answer**
endocrine

*Question*
Q: What group of animals has permeable skin that makes them vulnerable to pollution? Choices: - fish - mammals - reptiles - amphibians A:
**Answer**
amphibians