As the temperature rises, enzyme activity increases because more collisions occur between enzyme and substrate. If the temperature is too high, enzyme activity levels out and then declines rapidly because the enzyme is denatured.

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.

d we did this already