Q: What do red blood cells carry? Choices: - carbon dioxide - nitrogen - hydrogen - oxygen A:
oxygen

(Question)
Q: A catalytic converter filters pollutants in exhaust created by burning what before releasing it into the air? Choices: - carbon dioxide - noble gas - fossil compounds - fossil fuels A:
(Answer)
fossil fuels

Ques: Q: What do many mollusks secrete for their protection? Choices: - mucus - sedimentation shell - microscopic shell - calcareous shell A:
Ans: calcareous shell

(Q).
Q: Which is the fourth planet from the sun? Choices: - mars - jupiter - earth - mars A:
(A).
mars

Ques:Q: Where do lancelets live? Choices: - on land - riverbeds - deep sea caves - shallow ocean water A:

Ans:shallow ocean water

Ques: Q: Dietary proteins are broken down into what components when food is digested? Choices: - organic acids - protein acids - polymer acids - amino acids A:
Ans:
amino acids