Don't trust me on this one, but i'll say d.
The independent variable should be the plants you used.
Answer:
These organisms should be adapted to live in this enviroment, i.e., they need to have adaptations to breathe, to swim (fins), streamlined bodies to move through the water, to eat the food found in the region, etc. Moreover, in this environment, the diversity tends to be high because marine regions are often characterized by their richness.
A plant cell placed in a hypotonic solution will not lyse because the plant cells tend not to bust..
That would be a hypothesis
Hope this helps you :)))