Answer:
Sonographer
Explanation:
This is because sonography require four years to study in school and a sonographer is an health care scientists who specializes in using ultrasonic imaging devices to produce scans, videos, diagnostic images, three dimensional images e t.c.
D. Observe how coral colonized a sunken ship. Ecologists look at how a whole ecology develops and maintains itself, so in this case, the coral on the sunken ship would be a whole ecology and the person studying it would be an ecologist.
It makes the Earth livable for us creatures. We get protected from the Sun's harmful rays reaching to Earth, which makes Earth feel comfortable. Atmosphere also contains Oxygen and we rely on that everyday.
Molting occurs in all animals with exoskeletons, due to the fact that such animals cannot grow bigger than their shell without replacing their shell with a bigger one. That is the general idea
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