Why do vaccines work for some diseases but not others? The antigens produced by a vaccine only fight specific antibodies.
Vaccines only work against viral infections.
Vaccines only work against bacterial infections.
The antibodies produced by a vaccine only fight specific antigens.

the animal that would be cutest if scaled down to the size of a cat? elephant

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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