What is an orginasim that feeds off of a living host?

Parasites that live in the body are called endoparasites. An example of an endoparasite is a hookworm that lives in the hosts gut. 

Surrounding every nucleus is a double-layered membrane called the nuclear membrane or nuclear envelope. This membrane separates the nucleoplasm, or fluid inside the nucleus, from the cytoplasm, or fluid outside the nucleus.

A) 4 amusingb)alpha particle is a helium nucleus. it contains 2 protons and 2 neutrons.c)alpha particle has charge of +2.

Hmmm i'm not sure about this one