The answer is:
readily bonds (because nickel's valence number is 2)
Answer:
- allows fuels to burn forms
- is the gas that animals breathe
- forms ozone that absorbs the Sun's harmful rays
Explanation:
Oxygen is a powerful oxidizer (oxidizing agent or oxidant) that burns the fossil fuel, reacts with carbon, and produce CO2/CO. Although, it is not a sole oxidizer available on Earth but 99.9% of combustion reactions takes place in the presence of oxygen. It does the job by accepting electrons very fast in its valence shell.
Animals use oxygen to breath which produces ATPs through a series of chemical reactions particularly in electron transport chain. Again, it acts as a oxidizer and accepts electron in the electron transport chain. This gradient of electron flow is necessary for ATP production. In the end, water and CO2 are produced with ATPs.
Oxygen molecules in the stratosphere reacts with solar radiation (UV) and produce oxygen atoms. Thereon, each atom reacts further with the oxygen molecule to produce ozone. Ozone layer acts as a shield and doesn't allow penetration of harmful rays to the biosphere where living organisms are present.
No it is used in most of Europe. we are the very few who do not use the metric system.
Digestion is necessary because when food enters the body it has to be broken down in smaller particles and use for energy and growth for other parts of our body. If food does not digest it can cause acid reflux and other diagnoses.
C commensalism occurs when an organism is neither benefitted nor harmed