Answer:
<u>Mitochondrion</u>
Explanation:
Mitochondria are found in nearly all cells but most abundant in cells that require a lot of energy e.g., skeletal muscle, sperm cells and meristematic cells. They contain enzymes that catalyze and control reactions of respiration. The inner membrane is folded into cristae to create large surface area for attachment of enzymes.
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It is easier to move through the vanes and hold oxygen better
A river or steam / moving body of water