Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis, lipids provide cells with more-] A, nitrogen.
B. proteins.
C. structure.
D. energy.

Energy

Explanation: On a gram for gram basis lipids have the highest energy yield of all the food sources. They yield 9 kcal of energy per gram while carbohydrates and proteins yield only 4 kcal of energy per gram.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

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