A star is provided with energy by a nuclear fusion reactions in its core. A nuclear fusion reaction occurs when the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become one helium atom.
Answer:
oxygen
Explanation:
oxygen is carried away and to the heart by vein and artery
Molecules are the same element being held together by hydrogen bonds
compounds are different molecules being held together by different bonds
The sequence of the organization on earth are the following:
- Individual - that every single organism in our earth.
- POpulation - the number of the organisms
- Community - the group of organisms living in one location.
- Ecosystem - that involves more than the community
- Biome
- Biosphere.