are the leading causes of death worldwide
Answer: Omnivore
Explanation: A Carnivore eats meat, an Herbivore eats plants, and an Omnivore eats both
Electron shell is the outer orbital, while the inner orbital are just called orbitals.
Answer:
The answer for this question is the ureotelic
The atria of the heart merely need to allow blood to flow into the ventricle, and therefore aren't very muscular.
The ventricles of the heart need to actually pump blood to the rest of the body, whether to the lungs or the the rest of the body.