Lipids are essential for all life on Earth. They play many important roles in maintaining the health of an organism. Arguably the most important function lipids perform is as the building blocks of cellular membranes. Other functions include energy storage, insulation, cellular communication and protection.
Answer:
The activation energy must be reached. The catalyst makes lower energy pathways available.
Explanation:
Secretion helps in moistening the food, making it easier to swallow and preventing oral infections.
Engulfing is what happens during endocytosis, a form of active transport that takes large molecules into the cell. During this process, the molecule is trapped inside a newly-formed vacuole. Hope this helps! :)
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