Which of the following statements is correct?
a.
water is used to moderate (slow down) neutrons in a nuclear reactor.
b.
carbon control rods are used to absorb neutrons in a nuclear fission reaction.
c.
a very high temperature is required to initiate a nuclear fission reaction.
d.
the energy released from the sun is the result of a nuclear fission reaction.

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

What drives an advertising campaign?

How does food concentration affect yeast activity