Which elements, besides carbon, are found in all four types of
macromolecules?
o
a. oxygen and nitrogen
o
b. hydrogen and phosphorus
o c. hydrogen and oxygen
o
d. nitrogen and phosphorus

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

What are some natural processes that represent physical and chemical changes?

Which statement best addresses the differences in sex cell differentiation between the red-eared slider turtle and a human?