Q: What powerful microscopes use a beam of subatomic particles instead of a beam of light? Choices: - complex microscopes - scientific microscopes - nuclear microscopes - electron microscopes A:
electron microscopes

(Question)
Q: Decay of what provides some of earth's internal heat? Choices: - ionic elements - decaying elements - radioactive compounds - radioactive elements A:
(Answer)
radioactive elements

Ques: Q: Which region of dna consists of one or more genes that encode the proteins needed for a specific function? Choices: - mRNA - chromosome - antigen - operon A:
Ans: operon

(Q).
Q: What type of vertebrates are birds? Choices: - epidermal tetrapod - invertebrates - exothermic - endothermic tetrapod A:
(A).
endothermic tetrapod

Ques:Q: Some 96% of the dry mass consists of organic compounds produced by what? Choices: - erosion - electrolysis - reproduction - photosynthesis A:

Ans:photosynthesis

Q: Rise divided by run is called what? Choices: - hill - steep - mound - slope A:
slope