Answer:
I am going to guess A and C
Answer: By eliminating waste through the cell membrane.
Explanation: Like humans, we use the bathroom. That's how that waste goes out. When you eat your food and chew it into small parts enough for you to swallow, your body starts to absorb and move the nutrients to where they need to go. When you drink water to flush your food down, your large intestine starts absorbing the water, and the waste products from the food you ate becomes stool. Then those Nerves and hormones help digestive the food/waste.
Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike prokaryotes. Eukaryotes belong to the domain Eukaryota or Eukarya.
I think the independent variable has to do with either the size of fish they eat or where they get their source of food, and the dependent is the amount of DDT in the egg.
Hope this is helpful!