Question

What are the cell builders of the body? What is the system that releases energy, and requires oxygen?

Answer 1

1. Nucleus, Ribosome, ER, Golgi
2. Mitochondria

Explanation:

1. "Builders" is a bit vague. So I'll just lay out the purpose of each.
   Nucleus- gives instructions (RNA and DNA)
   Ribosome- makes proteins that make up important parts of the body
   ER(Endoplasmic Reticulum)- makes proteins and fat
   Golgi Apparatus- Packages the proteins, fat, etc and makes some hormones too

2. "The Mitochondria is the powerhouse of the cell!"