The physical barrier of the immune system is your body tissue and skin.
The answer is
A. The heart is a muscular pump that acts to circulate blood to deliver oxygen all over the body.
Answer:
c Your kidneys and liver might not function properly
OK so I believe the answer will be B. because they never really give you all the information but they will give you the core info.
He is able to express himself and exercises more. That’s why he’s happy.