How does the brain solve the problem when something in the body is not at normal levels?

Which type of respiration takes place when there is no oxygen present

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.

About __ of the mass of the cell is water