Similarities:
They contain nematocyst (cells that sting)
some are sessil/free swimming
Some corals have a symbiotic relationship with algae, they need to grow in shallow waters so that light can penetrate for the algae to photosynthesize.
Answer:
I believe your answer would be --
B.) They remove urine from the body.
Already answered in pm ;P
The correct answer is a Bar Graph.
Repetition, rhyming ... that's all I can think of
