Answer:
GENE
Explanation:
The functional segment of the DNA that contain instructions for a specific trait is known as a gene.
I think the correct answer from the choices listed above is option A. It is the alveoli that is composed of single layer <span>surrounded by a network of capillaries. These are used to allow oxygen and carbon dioxide to move from the lungs to the bloodstream.</span>
B) does not dissociate completely
