They drill holes and bring up samples of rock and study how seismic wave move through the earth.
The correct answer is B since the organism is just copying itself.
Answer:
Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. ... This occurs in two steps: first, bacteria convert ammonia in to (nitrites) NO2-, and then other bacteria species convert it to NO3- (nitrate). Nitriates are a form of nitrogen that is usable by plants.
Explanation:
Answer: They compare the number of mutations to determine how long ago species separated and evolved.
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