An atom with 6 protons and 6 neutrons will have a mass number of 6.

Electrons are found in the orbits (shells)of an atom.

The maintenance of relatively stable internal environment of the body: 

When organs are located on the same side of the body, they are considered to be: 

Bicarbonate ions help maintain: 

A reproductive cell that develops into a new organism without the need to fuse with another reproductive cell is a:

Titin is associated with the:

____ is a toxic substance within a biologic organism that is not normally present and does damage to the metabolism.

The three major parts of a cell are the cytoplasm, nucleus and the 

The _____ produced by the vascular cambium builds up to become the annual rings in a woody stem.