Where are the answer options and a picture of the problem?
Some characteristics that is shared is a soft body and an outer shell to protect their body.
I think it’s zero, it might be zero
Accualy some do, but that's a little rare, so I'm guessing because each child gets some of there mom and dad's to genetics, one child might get some of there mom's but more of there dad's and the other might get some of there dad's and more or there mom's..? not sure if that makes any sense-
