The reaction X + Y→Z has the rate law, Rate = k[X]2[Y]. If the concentration of X is doubled and the concentration of Y is tripled, the rate would be increased by a factor of

Which of the following involves only abiotic factors? a. a large rock being weathered by wind and rain b. an otter using a stone to break open a sea urchin c. a spider building a web in the corner of a building d. a pine tree absorbing light from the sun