Answer: D. Humans cultivated plants and domesticated animals.
Explanation:
The first agricultural revolution took place in prehistoric times, more precisely in the Neolithic period. The man led a nomadic lifestyle before that period; he was constantly on the move because of food search. In the Neolithic, man domesticated the first plant and animal species. The pig and the dog were the first animals, and the cereals the first plants. This encouraged man to form an evening of social community and form permanent settlements because he has had a secure food source ever since.
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Rock composition and measuring the seismic waves provide knowledge for the scientists to study the interior of the earth.
Explanation:
When the crust gets distributed it is easy to study the layers of the different materials that got settled and compacted in the earth. Patterns that are formed in the rocks provides to be a good source to know about the earth's crust. rock cores are cylindrical sections which are cut and removed from the earth crust for research purposes.
It is impossible to drill to the center of the earth and so scientists rely on seismic waves and the speed of the seismic waves depends on the material on which it is passing through. The toughness and stiffness obstruct the speed of the waves which is a means for the scientists to undertake research on the substance which hampered the speed of the seismic waves. P-waves, or pressure waves, which go through both liquids and solids, and S-waves, or shear waves which go through solids but not liquids. This provides the best data to undertake research regarding the earth' crust by the scientists.
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