Which of the following is considered to be the most significant cause of erosion?
a. water
b. ice
c. wind
d. glaciers

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

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

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?