The answers are
1. nitrogenous
2. acid-base
3. fluid
A codon is a sequence of three nucleotides in DNA or RNA that codes for either a particular amino acid or tells the cellular machinery to start or stop using the code. It isn't located anywhere specific.
Carbon dioxide because people in other animals exhale carbon dioxide as a waste product. People and other animals need oxygen for plants produce oxygen during an important process called photosynthesis which turns the sun energy into nutrients so carbon dioxide would be the answer.
The structure<span> of cells is linked to </span>their function<span>. For example, lung cells are very thin, which allows gases to diffuse easily through the cells</span>
