Which best completes the chart

D?

Explanation:

X: Mutalism

Both crabs and and anemones benefit from one another.

Y: Parasitism  

The flea is able to have a nice life on the dog at the expense of the dog's comfort.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.