Which describes a constant in an experiment?
a. the variable changed by the experimenter
b. the quantity that must remain the same
d. the variable that changes in response to the experiment
d. the statement that is worded to test the experiment

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.

Which type of organism is a caterpillar