Which is the best description for structures in chloroplasts called grana? an autotroph

a photosynthetic pigment

stack of chloroplasts

stack of thylakoids

How does natural selection change thephenotypes within a population over time?

Resperation is a way to release carbon back into the atmosphere

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations