Q: Answer the following question given this paragraph: Radiocarbon is useful for relatively young, carbon-based materials. Other longer-lived isotopes are good for older rocks and minerals. Q: Radiocarbon is useful for dating relatively young materials with what element as their base? Choices: - hydrogen - oxygen - nitrogen - carbon A:
A: carbon

Q: Answer the following question given this paragraph: Enzymes are classified by the types of reactions that they catalyze. Q: What is the basis of enzyme classification? Choices: - their shape - their color - their mass - reactions they catalyze A:
A: reactions they catalyze

Q: Answer the following question given this paragraph: Like roots, the stems of vascular plants are made of dermal, vascular, and ground tissues. Q: In vascular plants, what two basic structures are made of dermal, vascular, and ground tissues? Choices: - stems and flowers - roots and seed - fruits and nuts - roots and stems A:
A: roots and stems

Q: Answer the following question given this paragraph: Q: The effects of which kind of selection are larger than the effects of direct natural selection on individuals? Choices: - topical selection - stranger selection - unnatural selection - kin selection A:
A: kin selection