Question

What is oxygen and why oxygen is important​

Answer 1

Answer:

Oxygen:

• Oxygen is the chemical element with the symbol O and atomic number 8.
• Oxygen is essential for respiration because the body uses it to 'burn' food molecules.
• Animals take in oxygen when inhaling and give off carbon dioxide when exhaling.
• Oxygen makes up almost 21% of the total gases in air, with most of the remaining gas being physiologically inert nitrogen.

Answer 2

Answer:

Explanation:A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. ... Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms.

Characteristics and Properties

Under standard conditions oxygen forms a gas that is composed of molecules consisting of two oxygen atoms (O2). This is called a diatomic gas. In this form oxygen is a colorless, odorless, tasteless gas.