Help with these questions plsss

burning fossil fouls really decrease the carbon in the atmosphere so b

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.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)