Which best describes the cell theory?
a. scientists know all there is to know about cells, so the cell theory will not change.
b. as technological advancements are made, the cell theory may change.
c. a theory, once formulated, cannot be changed.
d. the development of a synthetic cell has caused the cell theory to change.

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u. s. fish and wildlife service

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

Select the correct answer from each drop-down menu. the lac operon in e. coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .