45 !
what is a disadvantage of the point count method of population monitoring?
a. it leads to the death of the sampled individuals.
b. it only records trends in population at fixed locations in the ecosystem.
c. it requires traversing through the ecosystem, which may be difficult in rugged terrain.
d. it’s only useful for monitoring organisms that are fixed in one place.
e. it requires capturing the animal for a brief period of time.

D. It’s only useful for monitoring organisms that are fixed in one place.

Explanation:

Point count method of population monitoring involves standing in a specific location and counting a population of animals, usually birds. The number of birds or the specie of bird within a circle of a specific radius is counted. The radius is usually made as big as possible in order to maximize information gathering. This type of population monitoring method can only be used for animals that have fixed location, for instance, birds living in a particular ecosystem.

a physical change is being made.

allowed for the prediction of the properties of missing elements.