1. What is an operon? a. The binding site for a repressor PRO.

b. Any group of genes responsible for the metabolism of lactose in a prokaryotes or eukaryotes.

c. A cluster of genes under the control of a promoter.

d. A regulatory gene.

this process is called "phosphorylation." a phosphate bond joins adenosine diphosphate to form adenosine triphosphate.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project