Which energy source generates radioactive waste? a. nuclear b. hydroelectric c. wind d. solar

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above