True. Lactic acid is caused by strenuous exercise. The lactic acid is formed because while working out, you don't receive as much oxygen.
Answer: The frequency at which new species emerge and are lost over evolutionary time is established by the rates of speciation and extinction.
Answer:
D (depressants)
Explanation:
I looked it up!
<em>"A depressant, or central depressant, is a drug that lowers neurotransmission levels, which is to depress or reduce arousal or stimulation, in various areas of the brain."</em>
Sorry if it's wrong, but I hope I helped!
Good luck!
For the first one it’s( lifting weights, climbing stairs, push ups squats) for the second one
