Caleb is sitting near the window on a sunny day. When he closes the curtain, the room becomes darker. What property of the curtain allows it to make the room darker?

Inspired by the example of that great cornellian, vladimir nabokov, some of your friends have become amateur lepidopterists (they study butterflies). often when they return from a trip with specimens of butterflies, it is very difficult for them to tell how many distinct species they've caught— to the fact that many species look very similar to one another. solution

What was the social class pyramid during the civil war?

What is one reason why so many corporations prefer to incorporate in the state of delaware?