Which of these is a waste material that is removed from the human body by the respiratory system?
carbon dioxide
water
oxygen
sodium chloride

What role do traits play in affecting an organisms ability to reproduce? finches

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.

Which of these is not a nucleotide base found in dna?