The correct answer that would best complete the given statement above would be the first option. Coral reefs are built by a small organism called a polyp. The polyp creates the structure of the coral reef by building a CUP out of a calcium carbonate. The skeletons of these tiny corals s<span>ecreted by the lower portion of the polyp. Hope this answer helps.</span>
If student’s data does not support her hypothesis, then the next MAJOR step would be to "<span>change the hypothesis" although more trials should be done first. </span>
It must be durable and available
Species could compete for water, food, land, etc.
