Answer:
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C) steroid, because it has 4 carbon rings
1. The group nearest the end or with the shortest stem of a phylogenetic tree has evolved most recently. In this case it is eutherians.
2. The group with the longest stem has been around the longest: fish
3. A direct common ancestor will share the same immediate line, like marsupials and eutherians. Fish and marsupials do not have a common direct ancestor.
Answer: O D. To provide molecules for the electron transport chain
Explanation:
The answer would be Igneous rocks, because of magma cooling