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what is the disadvantage of using models to study the food web?
a. observations are made from inside the system.
b. actual interactions are affected by the models.
c. they cannot show all the interactions taking place.
d. they cannot in making predictions about a population.

D. They cannot help in making predictions about a population.

Explanation:

A food chain is a sequence of distribution of matter and energy among the organisms when one organism is consumed by other organism. A food web is a network of two or more food chains.  

A model can be used to demonstrate the linkage between the different food chains and the network of two or more food chains. It can also be used for showing the interaction between organisms in a food chain.  

They cannot help in making predictions about a population as the population may face demographic factors such as death, birth, migration and emigration on the basis of this the determination of the exact number of members in the population is quiet difficult both in present as well as in the future.