Inhalation in humans is achieved by contraction of which muscles

Inhalation in humans is achieved by contraction of intercostal muscles (the muscles that are connected to the rib cage) and the diaphragm. The contraction of these organs open the lung’s volume, decrease the pressure thereby expanding the thoracic cavity and in this way inhalation occurs.

the calvin cycle has three stages. in stage 1, the enzyme rubisco incorporates carbon dioxide into an organic molecule. in stage 2, the organic molecule is reduced. in stage 3, rubp, the molecule that starts the cycle, is regenerated so that the cycle can continue

the answer is c cumulus. cumulus clouds can be seen on a gray and rainy day, because cumulus clouds create thunderstorms. give me brainliest if right.