Explain the changes
3 marks

The correct answer is - increase in the number during this period in the lake which suggests there are plenty of resources during this period required for the growth of the algae.

Explanation:

In the given graphical representation, there is a continuous increase in the number of algae present in the lake during the period of time between February to June. There is some fluctuation found in mid-April and early June but it is negligible.

This continuous increase in the number of algae suggests that during this period the resources are in abundance that affects the growth of the alage.

do you have a picture?

this is a good question! i'll do some research and come back when i have the answer!