Answer:
B. Fossils showed that all species are the result of gradual changes over time.
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Answer: a) proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.
Explanation:
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Answer:
Explanation:
There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.
Answer:
The enzyme needs copper ions to act as cofactors for optimal enzyme activity.
Explanation:
Watersheds can be large or small
Watersheds can also be called basins and drainages
Water that falls on the region