Answer:
A. Carbon dioxide travels from the heart to the lungs in pulmonary arteries
Explanation:
It is A. Those are all decomposers, the other answers like C are all animals. Decomposers are are biotic organisms that break down basically dead plants or animals.
Gas molecules across the membrane
It can be water molecules as well
Answer:
dna, fossils (fossil layers), similarities in embryos, and similarities in different organisms that are currently existing.
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Explanation:
