A "micrometer" is the best unit of measurement for measuring the size of an atom.
Answer:
Carbohydrates are made of hydrogen and oxygen with the general formula of Cm(H2O)
Answer:
List the features of gas exchange surfaces in animals.
1)They are moist to prevent the cells from drying and to allow gases to dissolve;
2)They have a large surface area , so that a lot of gas can diffuse across at the same time;
3)They have a high concentration gradient - maintained by the movement of air & blood.
C because oxygen was a byproduct of photosynthesis and proved to be EXTREMELY important in the atmosphere.
Answer: petroleum
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