Which characteristics describe this rock sample?
Check all that apply.
evidence of rapid cooling
evidence of slow cooling
small crystals
large crystals
smooth texture
coarse texture

it's evidence of rapid cooling

And small crystals and rapid cooling

Explanation:

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.