Describe two negative effects that water pollution can have on the environment. explain one way water pollution can be reduced.

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.

This is so important ugh its 25 points

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line