Why are pollen grains useful when studying the climate history of a region?

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

a. population growth is decreasing

-2

+4

-10

-3

-8

-3

so the population decreased by 24 because 3+3+8+10+2=26-2=24.

hoped i !

explanation:

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.