Which of the following best demonstrates a community? a desert with high heat and low rainfall
a pond filled with fish, turtles, algae and weeds
all of the abitoic and biotic factors found in a tropical rain forest
All of the penguins living in an area

Ineed to know why d is the correct answer asap

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of