Angry Aliens: Evolution

Game description
Angry aliens are invading earth! Shoot the invaders while teaching them a thing or two about evolution! Your knowledge and shooting skills just might save the world!
How to play
We will ask you a question or give you a clue. Shoot the alien commander with the vocabulary term that best matches the question or clue! Controls: Left arrow = move left Right arrow = move right Spacebar = shoot Special: Down arrow = grenades (levels 4, 6, 7, 8 and 9 only)