What change occurs in muscles at the anaerobic threshold?

A change that occurs in muscles at the anaerobic threshold is that the body begins to convert to fermentation instead of the Krebs Cycle.

i think its the first one

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles