Find a word relating to Endangered Species or Conservation from the list, then set your cursor at the beginning of the word, hold your mouse button down, and "drag" to the end of the word---and let the button up. If you've selected the right word, it will remain circled and disappear from the list. Words can be found spelled frontward, backward or diagonally. After you've found all of the words, you can mix up the words and try again.