Question

A gaseous nonmetal, the most abundant element on Earth. It makes up some 21% of Earth's atmosphere and is essential to most forms of life.

Options:
A) Nitrogen
B) Oxygen
C) Hydrogen
D) Carbon

Answer 1

Oxygen is the most abundant element on Earth, making up about 21% of Earth's atmosphere. It is essential for most forms of life and is used by all living things to make molecules that are necessary for life.

Step-by-step explanation:

Oxygen is the most abundant element on Earth, making up about 21% of Earth's atmosphere.

It is essential for most forms of life and is used by all living things to make molecules that are necessary for life.

Oxygen is also a necessary reactant in the combustion process and dilutes nitrogen to prevent rapid burning at the Earth's surface.