4. which adaptation determines whether a land plant can also thrive in an estuary a. ability to perform photosynthesis in dim light
b. ability to perform photosynthesis underwater
c. tolerance to salt water
d. tolerance to fresh water

the organisms are not adapted to live in some communities or habitats.

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.