Answer: The answer is D
Explanation:
The logic of random assignment is to assign individual participants into different groups in an experiment through randomization so as to give every participants an equal chance of being assigned to any group, and reduce other characteristics that could influence the differences between the groups at the end of the experiment.
Answer:
The Cambrian Explosion!
Explanation:
Sounds exciting right?
WELL IT IS!
The Cambrian explosion or Cambrian radiation was an event approximately 541 million years ago in the Cambrian period when practically all major animal phyla started appearing in the fossil record. It lasted for about 13 – 25 million years and resulted in the divergence of most modern metazoan phyla.
So in your case the answer would be 542 million years ago or the first animals with exoskeletons appear.
Religion has spread through cultural diffusion, such as trade routes, post services, and/or aid due to poverty.
by the oldest symbols called cave paintings formed by rock art
