It is important to know chemistry first because you need to know what might happen or is happening if you do an experiment in biology. An example would be that my class just did an experiment with yeast and we needed to know about CO2 and how it was working and everything else. Hope this helps.
Answer: D. competition
Predators compete with each other in order to achieve prey for food. Since owl hunt at night and hawks hunt in the morning, there is a way unlikely chance they would encounter one another to fight for food.
A fern is a vascular plant.