Iam unsure of how to start this problem at all can you

1) sections 1, 2, and 10 are significant primarily because they suggest the likelihood that a) widow wycherly is actually the woman in the full-length portrait. b) dr. heidegger wants to include his guests in an experiment with the water. c) dr. heidegger plans to drink some of the water from the vase and needs witnesses. d) the guests will be asked to witness dr. heidegger's transformation when he drinks the water.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?