Most bacteria prefer to use glucose as a carbon source. However, if glucose is not available, the bacteria can use the sugar lactose as a carbon source instead. In order for bacteria to use lactose, they must make an enzyme to break down the lactose. This enzyme is called lactase. If there is no lactose, the bacteria will not make the enzyme. This production of lactase is an example of -
A. cellular respiration in prokaryotes
B. genetic variation between organisms
C. an organism adapting to its surroundings
D. regulation of gene expression

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

answer; hydrologic cycle;