Answer:
lipid, fatty acid, cell membrane
protein, amino acid, enzyme
carbohydrate, sugar, starch
nucleus acid, nucleotide, DNA
D. The discoveries confirmed many but not all of the classifications that were based on observable traits, and scientists revised classifications when necessary.
The existence of land bridges was used to dispute continental drift
But the many-celled algae, make their food by photosynthesis. Plants have complex, multi-cellular reproductive systems and might need wind, birds, or bugs for pollination. Algae can reproduce through tiny spores or even by replication or the growth of broken piec
