When living things die, why are there only bones remaining after some time?​

When an organism is buried quickly, there is less decay and the better the chance for it to be preserved. The hard parts of organisms, such as bones, shells, and teeth have a better chance of becoming fossils than do softer parts. One reason for this is that scavengers generally do not eat these parts.

Explanation:

ANSWER Decomposers break down dead material.

Explanation:

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the answer is d. chordata