Atoms of carbon, oxygen, and hydrogen are found in all biological macromolecules. Which macromolecules are made ONLY of these three elements?
A carbohydrates only
B. carbohydrates and lipids
C. carbohydrates, lipids, and nucleic acids
D. lipids, proteins, and nucleic acids
O
E. carbohydrates, proteins, and nucleic acids

what have fossils ever done for you

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.