Answer:
alveoli
Explanation:
They are the smallest structures in our lungs where capillaries exchange O2 and CO2 in blood.
Answer:
True and The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants
By acting as decomposers on dead plants and animal
Melanin is a pigment that is produced by cells known as melanocytes in the skin of most animals, including humans. ...
<span>Antibiotics work by selectively targeting the reproduction or growth of specific bacteria cells and by not attacking human DNA. Antibiotics do not, or should not, target and affect human DNA gyrases, although they should target the specific bacteria growth. The host, (human) DNA needs to remain unharmed while the bacteria does not replicate.</span>
