1) All levels of life have systems of related parts.
2) Structure and function are related in biology<span>.
3) Organisms must maintain homeostasis to survive in diverse environments.
</span>4<span>) Evolution explains the unity and diversity of life.</span>
The answer is a. I got it right
-Cumulus
- Stratus
- Cirrus
As a little interesting fact: Nimbus
I hope this helps! :)
An atom consists of an atomic nucleus composed of positively charged protons and neutral or uncharged neutrons.