Hundreds of years ago, which of the following did doctors believe was a major cause of disease? A. Bacteria
B. Leeches
C. All of these
D. Unbalanced humors

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

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

Which of the following is not associated with invasive species?