How did Mendel know that any variation in the offspring of the crosses he did result only from his experiments?
I

the answer is 1. photosynthesis. glad to

b.have there own function.

explanation:

idk

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.