The main reason is because they are heavy, and because they don't have to chase their food. They're not predators and their shells give them protection like running away gives protection to other herbivores.
The difference between matter and energy is that energy is produced from matter yet has no mass and is the capacity to do work while matter is the physical "stuff" in the universe. Matter needs energy to move.
Overproduction of offspring, inherited variation, and the struggle to survive.
So: b, d, and e
Answer:
Gametes are an organism's reproductive cells.
Explanation:
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