Q: What is already causing food and water shortages and species extinctions? Choices: - urbanization - immigration - zero population growth - global warming A:
global warming

(Question)
Q: Do most humans feed at one trophic level, or more than one? Choices: - less than one - one - none - more than one A:
(Answer)
more than one

Ques: Q: Mitosis and meiosis are both forms of division of the nucleus in these? Choices: - converts cells - endogenous cells - reproduction cells - eukaryotic cells A:
Ans: eukaryotic cells

(Q).
Q: What do cells produce as they age? Choices: - carcinogens - wrinkles - oxidants - proto-oncogenes A:
(A).
proto-oncogenes

Ques:Q: Lava erupts through long cracks in the ground, also called what? Choices: - ridges - crevasses - faults - fissures A:

Ans:fissures

Question: Q: Because alkali metals are so reactive, they are found in nature only in ________ with other elements? Choices: - isolation - cooperation - competition - combination A:
Answer:
combination