Answer 1:
No - the blood cell immune systems are unique
to animals, because plants and fungi do not have
blood. What they have instead are chemical and
physical defenses; plants for example can seal
off portions of their vascular tissue (the
tissue that conducts water and nutrients through
the plant), thus cutting off an infection and
stopping it that way. I don't know how fungi do
it, but fungi consist of long strings of cells
joined to each-other on end in networks, and
I'll be their defense system is similar.
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