Answer:
i want to ive in habitat a
Explanation:
mark me brainliest bc im smart and helped aloyt
T-cells are a type of white blood cell that circulate around our bodies, scanning for cellular abnormalities and infections.
The immune system, and the excretory system
(Honestly, all of them work to keep us 'healthy', but I believe these are the ones you're looking for)
C I did bio last year and had an A every quarter
