Corals are cnidaria which makes coral reef which is of calcium carbonate and act as eco system in deep marine water !
so the most appropriate answer is C !
It uses energy to move things through the process of homeostasis
1. MUSCLE TISSUE : allows the heart to contract
2. CONNECTIVE TISSUE : insulates the body
3. EPITHELIAL TISSUE : forms the outer, most protective layer of the body
4. NERVOUS TISSUE : allows the brain to respond to stimuli. Others include sensory input, integration, control of muscles and gland, homeostasis, & mental activity.
(I answered another question just like this two minutes ago, not sure if it was the same person :)
Answer:
There are many threats to biodiversity today. The biggest ones can be remembered by using the acronym H.I.P.P.O.: Habitat Loss, Invasive Species, Pollution, Human Population, and Overharvesting.
The adult skeleton contains 206 bones (unless you count the sternum as 3 separate bones, which would make it 208),