Question

Which of the following explain why elements such as carbon that make up organic molecules are not permanently removed from the environment?

Pun intended — It's the carbon cycle

a
They are constantly produced from soil nutients.
b
They are replenished by sunlight.
c
They are replaced by volcanic eruptions.
d
They are cycled through ecosystems.

Answer 1

The correct explanation is:

**d** They are cycled through ecosystems.

The carbon cycle describes how carbon is constantly being exchanged between the atmosphere, land, water, and living organisms, ensuring that carbon remains available and is not permanently removed from the environment.