Unlike reptiles and amphibians, birds generate their own body heat, what does this mean for birds?​

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the supermassive black hole is in the middle of the galaxy.

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the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers