From single-celled ancestors, they evolved into a riot of complexity and diversity. An estimated seven million species of animals live on earth today, ranging from tubeworms at the bottom of the ocean to elephants lumbering across the African savanna.
Answer:
The magnets are placed side by side with the opposite poles of each magnet near the other (Option D/Option 4)
Explanation:
The two moved towards eachother when released, and that will only happen the opposite poles are facing eachother.
Sorry if this doesn't make much sense.
C. Incus The Incus sends sound vibrations to the inner ear.
Pioneer species. They are the usually the first to grow after an ecosystem has been destroyed(in this case by flood).
In frogs, different mating seasons are a barrier to reproduction.