The gene to make what vitamin did scientists put into rice to make it more healthy?*
Vitamin A
Vitamin C
O Vitamin D

Study the diagram of a desert food chain . what would most likely happen if the kangaroo rats were killed off and removed from the food chain ?

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?