Ques: Q: Biological macromolecules are organic, which means that they must contain what? Choices: - hydrogen - aluminum - oxygen - carbon A:
Ans: carbon

Ques: Q: What term means the abnormal or excessive extension of a joint - particularly a hinged joint - beyond its normal range of motion, thus resulting in injury? Choices: - sprain - tear - hypercorrection - hyperextension A:
Ans: hyperextension

Ques: Q: Why are the stems of many xerophytes fleshy? Choices: - drains water - pressures water - collects water - stores water A:
Ans: stores water

Ques: Q: By pulling out grass by its roots and over-grazing, livestock contribute to what negative process? Choices: - migration - evolution - immigration - erosion A:
Ans:
erosion