Answer:
Oxygen
Explanation:
Glucose reacts with water to form carbon dioxide, water and give energy.
Yes because I think that more-complex cells need the chromosomes for help
The heaviest elements settled in the Earth's center.
The Earth on the other hand starts with a core of iron and radioactive materials such as uranium and plutonium, which release energy in the form of heat, through a process known as nuclear fission. It went through a fusion stage - a "liquid-pasty" state - which allowed that, due to gravity, the denser materials sank towards the center, while the lighter ones floated towards the crust, a process called planetary differentiation.
Earthworms maintain homeostasis by having a dual circulatory system, which contains the closed circulatory system and the coelomic fluid for respiratory gases, food and waste.