It is in your text book .
Check in your text book
5 atoms 2 iron and 3 oxygen I hope this helps
The biosphere is made up of all living things (organisms).
The biosphere includes animals, biomes, population, communities, and ecosystems. The biomes are climate regions which can contain certain types of animals and plants. An ecosystem is all living things in one specific area, also such as plants, animals, and organisms.
It can become an ion because it can lose or gain an electron. It can become a part of molecule because it can form covalent bond with other atoms to gain a full valence shell.