'Nitrogen makes up around 78% of the atmosphere; this gas, only about 20%'
oxygen
BASIC SCIENCE: Nitrogen makes up around 78% of the atmosphere; this gas, only about 20%
Nitrogen makes up around 78% of the atmosphere; this gas, only about 20%
Nitrogen makes up around 78% of the atmosphere; this gas, only about 20%
BASIC SCIENCE
oxygen
BASIC SCIENCE