A secondary source is anything written after the fact
Answer:
Microbacteria
Explanation:
hope it helps if not let me know so i can edit this answer
The immune system works to keep germs out of the body and destroy any that get in. The immune system is made up of a complex network of cells and organs that protect the body from infection. Lymph nodes are part of the immune system. They release lymphocytes, a certain type of white blood cell that fights infection.
Answer:
Do you mean the definition?
I think it is "population density". Population density is the number of individuals per unit area or volume.
Explanation:
