They didn't stop laughing until the end of the film. is it a preposition or subordinating conjuntion

Explain how you might determine the rate of weathering on a sample rock

The y-value if a data point corresponding to x1

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.