Because they are non renewable sources of energy and they took billions of years to form.
<span>a. an element is a substance that cannot be broken down</span>
Answer:
Zygote
Explanation:
A zygote is a (diploid) cell formed through fertilization between two gametes. Zygote cells are eukaryotic, and in the human body, they are the first cell stage of pregnancy.
Have a lovely rest of your day/night, and good luck with your assignments! ♡