Q: What is the exchange of gases between the body and outside air? Choices: - metabolism - secretion - expulsion - respiration A:
respiration

(Question)
Q: When matter recycles and changes state what does it gain or lose by doing so? Choices: - density - volume - fuel - energy A:
(Answer)
energy

Ques: Q: Homologous chromosomes move toward what poles? Choices: - interior - parallel - octogonal - opposite A:
Ans: opposite

(Q).
Q: Why do electronegativities decrease from top to bottom? Choices: - smaller atomic size - larger atomic variation - larger electric pull - larger atomic size A:
(A).
larger atomic size

Ques:Q: How many valence electrons does helium have? Choices: - Five - six - three - two A:

Ans:two

Q: What natural destructive element cuts away at rock forming river valleys? Choices: - sediment - lava - air - water A:
water