In general, the most materially advanced and developed countries are focused on extensive development of the sector of their economy.
a. tertiary
b. secondary
c. primary
d. quaternary

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds

answerpalpalis group;