Question

Guys help!

A class was studying human body systems. The students learned about a system that moved oxygen to the cells and contained structures that help the body fight infections.
The class was studying the —
A. endocrine system
B. circulatory system
C. digestive system
D. muscular system

Answer 1

D muscular system

Step-by-step explanation:

because the muscular system can fight off anything if your strong

Answer 2

B.circulatory system

Step-by-step explanation:

it would the circulatory because digestive is stomach, endocrine is hormones, and muscular is well your muscles