To survive on earth, the first cells needed the ability to

make their own food

take in oxygen from the atmosphere

combine to form multicellular organisms

use chemicals in their surroundings for energy

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. this is an example of speciation.

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

What is used to keep track of the gamates and possible offsprings combination