Q: Acid rain may be caused by what? Choices: - hurricanes - water pollution - volcanos - air pollution A:
air pollution

(Question)
Q: The heart contracts rhythmically to pump what to the lungs and the rest of the body? Choices: - Bile - Cerumen - Chyle - blood A:
(Answer)
blood

Ques: Q: New seafloor forms when what object cools? Choices: - ash - debris - rain - lava A:
Ans: lava

(Q).
Q: Eukaryotic cells undergo what kinds of divisions that more primitive cells do not? Choices: - budding - meiosis - homologous - mitosis A:
(A).
mitosis

Ques:Q: A period is a horizontal row of the what? Choices: - cycles table - phases table - species table - periodic table A:

Ans:periodic table

Ques:Q: How many electrons does lithium have? Choices: - four - seven - two - three A:

Ans:
three