()a scientist observes that, when the ph of the environment surrounding an enzyme is changed, the rate the enzyme catalyzes a reaction greatly decreases. which statement best describes how a change in ph can affect an enzyme? 1points a a ph change can cause the enzyme to change its shape. b a ph change can remove energy necessary to activate an enzyme. c a ph change can add new molecules to the structure of the enzyme. d a ph change can cause an enzyme to react with a different substrate.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Give examples of selective advantage of organism’s body part/organ

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase