1. Immunological memory:- present in vertebrates but absent in
2. Vertebrates have complement system but invertebrates have
3. Vertebrates have lymphocytes but invertebrates have
4. Antibody present in vertebrates and nit in invertebrates
The relationship between a system and sub-system, is that they
are both a part of each other. If a circle is the system, the
different pieces inside of this circle are the sub-systems. You
cannot have one without the other.
Invertebrates have different structures and tissue
organizations. They do not have four limbs, they do not have eyes
with true lenses often, they usually don't have a skeleton like
ours, their organ systems all work differently from ours.