How did life as we know it come from?

What was the land like over 500 million years ago? what was under the sea?

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.