Astudent measured the time required for a protein sample to be completely digested in the presence of an enzyme under different ph levels.
at which ph are all three of the enzymes below the least effective?

a. 2
b. 5
c. 7
d. 10

the answer would be knowledge about cars!

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.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .