Compare and contrast visible light and ultra violet rays coming from the sun. a) ultraviolet waves are energy waves and light is not. b) light are energy waves and ultraviolet rays are not. c) both are waves of energy, but ultraviolet waves cannot be seen. d) both are waves of energy, but visible light waves are more dangerous.

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.

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

What's the waste product of electrons and pyruvate combining in fermentation?