The hyenas and lions from The Lion King compete for territory
The answer is A. Mutualism. Both the flower and the insect benefit from the relationship; the flower is pollinated and the bee gets nectar.
A scientist may use molecules - enzymes, proteins, DNA, RNA - to test for similarities, because if anatomy alone was used, it would be difficult to link traits and characteristics between the two organisms. For example, a rabbit has an endoskeleton and a closed circulatory system, while a fly has an exoskeleton and hemocoel.
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A thin, moist, selectively, permeable membrane.
The dirt doesn’t, but soil contains bacteria- fungi, and the dead/decaying waste byproducts. So the answer is technically yes