Answer the following question given this paragraph: Total internal reflection occurs when light goes from a slow (high index of refraction) medium to a fast (low index of refraction) medium. With total internal reflection, light refracts so much it actually refracts back into the first medium. This is how fiber optic cables work: no light leaves the wire. Q: When does internal reflection occur? Choices: - when light goes from a slow medium to another slow medium - when light goes from a fast medium to a slow - when light goes from a fast medium to another fast medium - when light goes from a slow medium to a fast A:
when light goes from a slow medium to a fast

Answer the following question given this paragraph: Most STIs are caused by bacteria or viruses. Bacterial STIs can be cured with antibiotics. Viral STIs cannot be cured. Once you are infected with a viral STI, you are likely to be infected for life. Q: Bacterial stis can be cured with what? Choices: - pesticides - antioxidants - antiviral drugs - antibiotics A:
antibiotics

Answer the following question given this paragraph: For photosynthesis, stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen. Stomata are flanked by guard cells that swell or shrink by taking in or losing water through osmosis. When they do, they open or close the stomata. Q: Stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen that take place during what process? Choices: - glycolysis - spermatogenesis - fertilization - photosynthesis A:
photosynthesis