B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Answer:
Crossing over is the swapping of genetic material that occurs in the germ line. During the formation of egg and sperm cells, also known as meiosis, paired chromosomes from each parent align so that similar DNA sequences from the paired chromosomes cross over one another.
Explanation:
Cats are carnivorous.
This is because. it<span> is a distinct array that comprises of above 280 class of placental vertebrates. Its constituent are formally known to as carnivorans.</span>
Answer:
The factor that is tested is called the variable.
The variable is also what is changed in an experiment.
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