Q: What forms when the metal sodium gives up an electron to the nonmetal chlorine? Choices: - covalent bond - van der waals force - hydrogen bond - an ionic bond A:
an ionic bond

(Question)
Q: What does ozone in the stratosphere protect us from? Choices: - comets - acid rain - solar traces - solar rays A:
(Answer)
solar rays

Ques: Q: Between meals, when the level of blood glucose drops below a certain point, a signal is sent to what organ saying "make more glucose"? Choices: - pancreas - kidney - brain - liver A:
Ans: liver

(Q).
Q: What results when a force does work? Choices: - side effect - momentum - pressure - movement A:
(A).
movement

Ques:Q: The epochs of the universe are known back to very shortly after what 'explosive' event? Choices: - Biggest bang - Explosive bang - major bang - big bang A:

Ans:big bang

Q: What is the process that allows organisms with better traits to survive and produce? Choices: - spontaneous mutation - adaptation - succession - natural selection A:
natural selection