Select the correct answer from each drop-down menu. Complete the given statement with the most appropriate words. A cat hissing in self-defense is an example of a(?) trait, whereas an instructor training a dog to perform tricks is an example of a(?) trait.
Astronomers are able to detect the dimmer star because its gravity causes the bright star to . Astronomers can also spot the dimmer star by observing a phenomenon called a(n) binary.
An attempt to document and identify all biological species living in some defined area, usually a park, reserve, or research area. The numbers of species on earth is rapidly diminishing, knowing what species are around will give us an idea of what we're losing, how our actions are affecting the environment.
Answer: Tornadoes form when warm, humid air collides with cold, dry air. The denser cold air is pushed over the warm air, usually producing thunderstorms.