A coral reef is a complex [ecosystem] of calcium carbonate shells that are home to microbes, algae, invertebrates, and fishes, and its high productivity helps provide great species richness.
Answer:
5 billion .........m.......m
Activation of muscle contraction could be a speedy event that's initiated by electrical activity within the surface membrane and transversal (T) tubules. This can be followed by unharness of metal<span> from the inner membrane system, the sarcoplasmic reticulum.
</span>Nervous stimulation causes a depolarization<span> of the muscle membrane (sarcolemma) </span>that<span> triggers </span>the discharge<span> of </span>calcium<span> ions from the sarcoplasmic reticulum.</span>
Answer: DNA provides a set of chemical instructions to specific genes that the gene uses to make proteins in order to determine traits.
Explanation: Genes provide instructions that are used to determine the sequence of amino acids needed to make up a protein.
the answer is A. atherosclerosis because veins mess with nerve system and arterio does something with arteries