That animal doesn’t get the full energy of the plant, just like you say, but to make up for that, the animal eats lots and lots of plants (or lots and lots of animals), so the end result is that animals have a higher energy input than plants. They *need* more energy because they move around. It doesn’t take as much energy to just sit there, like plants do.
Also we eat the parts of animals with energy concentrated in them. Other parts of the animal like bones and intestines have a lower concentration of nutrition.
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