Mark's dentist gives him a shot before performing a root canal. The dentist says the shot is anesthesia and mark won't feel any pain. Mark feels his gums going numb, while the rest of his body is working fine. What has the anesthesia actually done?

The anesthesia has deaden the nerves in the tooth so no pain will be felt.

Hope this helps.

69 is the correct math for the amino acids

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.