Ques: Q: What in hemoglobin gives red blood cells their red color? Choices: - calcium - lead - barium - iron A:
Ans: iron

Ques: Q: Maintaining a high metabolic rate takes a lot of what? Choices: - fuel - hydrogen - power - energy A:
Ans: energy

Ques: Q: What is the name for membrane-bound sacs that function in storage and transport? Choices: - alleles - cells - tubules - vacuoles A:
Ans: vacuoles

Ques: Q: An important chemical compound, which supplies living things with the energy they need to survive, is composed of carbon, oxygen and atoms of what other element? Choices: - magnesium - nitrogen - calcium - hydrogen A:
Ans:
hydrogen