C. People left farms to find jobs in the new industries found in and near cities.
but i'm not sure
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.
Ailurophobia, or the phobia of cats, affected Alexander the Great, Napoleon, Mussolini, even Adolf Hitler.
<h3>What did Alexander the Great become famous for?</h3>
Macedonian ruler Alexander the Great ruled over sections of Asia, Egypt, the Middle East, and the eastern Mediterranean in a very brief amount of time. His dominion brought about substantial cultural changes in the countries he conquered and altered the history of the area.
<h3>Why was Alexander hailed as a hero?</h3>
Many things make Alexander the Great a hero. He consolidated control over the whole ancient world thanks to his military prowess and bravery. Alexander did more than just create the biggest empire the world has ever seen; he also introduced Western philosophy, science, and math to that empire.
To know more about Alexander visit:
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Differentiation of CD4 T cells is the key step in generating and coordinating the three different immune modules.
<h3>What are these modules?</h3>
- Th1➾monocytes/macrophages enhanced
- Th2 ➾ eosinophils, basophils, mast cells
- Th17➾neutrophils
The adaptive immune response is also called acquired immunity and consists of activating the organism's defense throughout the organism's life and as microorganisms and other threats come into contact and cause possible damage.
Learn more about the adaptive immune response:
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Preexisting norms and patterns of behavior.
properly approach is best behavior
