B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Answer:
A. chromosomes are made of DNA
Explanation:
Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.
Answer:
Group 1 of frogs.
Explanation:
It is the first thing because you have to note which of the frogs you're talking about before you start.
