What is the only effective way invertebrates fight off disease?

Answer: The fish population would increase.

This is because if the number of birds decrease the number of  fishes would automatically increase as there would be less birds to eat the fishes.

According to trophic pyramid if the number of species at higher tropic level decreases the number of species at lower trophic level increases

• Rest all the options has no interconnections like grass has nothing to do with the fishes and birds as well

• Fishes cannot occupy bird's niches because both the niches are different

• The grass and fish cannot compete for resources because their resources are different

Answer:

The second option which is, "The grass population will increase" is the correct option.

Explanation:

• In the above picture, a bird is eating a fish from the pond. if the population of birds in a community decrease due to some reasons, then there will be no birds for eating fishes.
• This will cause an increase in the population of fishes.
• But there is no connection of grass with the increase and decrease of birds species.
• In ecological pyramids, Birds (secondary consumers) are high than the fishes (primary consumers).
• As secondary consumers eat primary consumers.
• Hence the decrease in secondary consumers will increase the population of primary consumers.

Answer:

it is C. Insertion

Explanation:

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