The answer is the first 1. i think. :p
The original source of phosphorus in a terrestrial ecosystem is soil microorganisms. soil becomes deficient in phosphorous leading to ecosystem retrogression. phosphorous can be found in our body, it builds strong bones and teeth.
hope it helps!
Monomers are joined by the COVALENT BOND..........
The correct answer that would best complete the given statement above would be the third option. Bones act as a frame to which STRIATED MUSCLES are attached for movement. Striated muscle<span> is attached to bone and produces all the movements of body parts in relation to each other. Hope this answers your question.</span>