Which is a nonpoint source of pollution?

a.) tourists throw trash into the ocean.
b.) a car mechanic pours oil on the ground.
c.) rain contains chemicals that seep into the ground.
d.) a pipe dumps waste from a factory into a stream.

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

Which is the correct formula for photosynthesis