Q: What is the most abundant element in the universe? Choices: - oxygen - helium - fluoride - hydrogen A:
hydrogen

(Question)
Q: What is the gas that gives rotten eggs and sewage their distinctive smell? Choices: - calcium sulfide - methane - hydrogen peroxide - hydrogen sulfide A:
(Answer)
hydrogen sulfide

Ques: Q: Approximately how many weeks does the fetal period last? Choices: - 10 weeks - 25 weeks - 27 weeks - 30 weeks A:
Ans: 30 weeks

(Q).
Q: Tissues of marine bony fishes gain what from their surroundings? Choices: - toxins - absorb salts - mercury - excess salts A:
(A).
excess salts

Ques:Q: What are a class of biochemical compounds that living things use to store energy? Choices: - hydrocarbons - proteins - calories - lipids A:

Ans:lipids

Q: What molecules with a nitrogen base are the basic components of nucleic acids? Choices: - sporozoans - enzymes - nuclides - nucleiotides A:
nucleiotides