Can you solve this riddle?

I am a pinkish color,
and have a roundish shape in you.
I am very soft, and you should protect me,
because I am very important,
and you need me to live.
All the other animals need me,
but not plants.
For their size, I was small in a dinosaur,
and I am much larger in you.
Now tell me, what am I?

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