... known as a greeting rumble. Animals partake in play that they seem to enjoy greatly, and there seems to be no other goal than to play. Studies in the field of chemistry have shown that play is enjoyable. Studies have shown that the level of dopamine increases in rats when anticipating the chance to play. Also reptiles such as iguanas exhibit sensory ... ...

• Word Count: 1271
• Approx Pages: 5
• Grade Level: High School

... organisms have been evolving to escape our controls. Moreover, scientists can perform experiments to study evolution in real time, just as experiments are used to observe dynamic processes in physics, chemistry, and other branches of biology. To study evolution in action, scientists use organisms like bacteria and fruit flies that reproduce quickly, so they can see changes that require many generations ... ...

• Word Count: 1289
• Approx Pages: 5
• Grade Level: Undergraduate