B. Decayed matter - earthworm-duck
Answer:
crops is a renewable resources, coal, natural gas and oil are not renewable as they will not last forever.
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All of above choices are functions of antibodies
Arthropoda and molluscs have open circulatory systems - meaning haemolymph (Their equivalent to blood) directly bathes the tissue, and isn't enclosed in blood vessels, as seen in a closed blood system, as in humans for example.
