What is causing us to lose species on a daily basis?
a. effects of pollution
b. effects of ecosystems
c. effects of other species

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum