Q: What are the gas giants mostly made of . Choices: - calcium and helium - nitrogen and helium - hydrogen and carbon - hydrogen and helium A:
hydrogen and helium

(Question)
Q: What is the term for the breakdown of unstable isotopes into stable elements? Choices: - isotopic decay - radioactive decrease - secondary decay - radioactive decay A:
(Answer)
radioactive decay

Ques: Q: What keeps earth in orbit around the sun? Choices: - energy - motion - momentum - gravity A:
Ans: gravity

(Q).
Q: What are two common weather characteristics of hurricanes? Choices: - low winds and sandstorms - high winds and snowfall - small winds and rainfall - high winds and rainfall A:
(A).
high winds and rainfall

Ques:Q: What type of craniates have backbones? Choices: - juveniles - invertebrates - larva - vertebrates A:

Ans:vertebrates

Q: What process would be impossible without some variation in the inherited traits of organisms within a species? Choices: - environmental selection - darwin's selection - characteristic selection - natural selection A:
natural selection