Why do the blue Dragon sea slug and algae have a mutualistic relationship?

Why was scientific questioning discouraged in the middle ages? How is strontium purified? When stored at room temperature in loosely capped containers what dietary lipids would turn rancid in the shortest time? What actions causes current in an electric circuit? What is the use of swallowing? What island is at 10 degrees east and 40 degrees north? In the digestive system what part of the body precedes the small intestine? Why the surface of ice raises when it changes from water into ice? What can be done to reduce the amount of sulphur dioxide produced? Are infrared radiations emitted by glowing of firewood? What are the magic numbers in chemistry? Is the rabaul volcano on a hot spot? Brief note on Depletion of the ozone layer? What is the legal age to sell fireworks in Texas? How do you cut copper tubing against a wall? What is a broad flat topped area with steep sides? What is chlorbutol? What term refers to a sons romantic obsession with his mother? Are teeth a biotic factor? Why are some units of geologic time scale longer and some shorter?