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Are there really alien civilizations out there that we don't know about? Find out on this Moment of Science: "The Fermi Paradox".
The root of the addiction lies not just in this chemical, but in the chemical receptors located in the whiskers just outside of the caterpillar’s mouth.
After all, for the basic body plan to change, not only do you need a random genetic mutation that results in a sixth finger, but that mutation must also provide an evolutionary advantage when it comes to reproduction.
Carnivorous plants still rely on photosynthesis as their main source of energy. However, because they grow in areas where the soil lacks essential nutrients, they use the insects they capture as a source of nitrogen and other minerals.
While in the tube, the worm’s tail end might be immersed in temperatures as hot as 178 degrees Fahrenheit, while its head rests in cooler water, as moderate as 72 degrees Fahrenheit.