Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well.
Britain and Belgium were the first countries to undergo an industrial revolution primarily because natural resources, such as coal, were available, as was a work force already organized into trade unions.<span>
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SPERM
Sperm are continuously produced by males, while a female is born with a full supply of eggs.
Characteristics of egg cells and sperm cells.
<span>*Egg cells are usually formed in a female before birth while sperm cells form during puberty. </span>
*Egg cells are produced in the ovary of a female human being while sperm cells are produced in the testicles of a male human being.
<span>*Egg cells are included in the largest cells in a female body while sperm cells are the smallest cells in the male body.</span>
Alfred Wegener had two flaws with his initial hypothesis. They are as follows:
i) Gravitational forces of the moon and sun, and tidal forces act as the mechanism to move the continents across the globe.
ii) Larger and sturdier continents broke through thinner oceanic crust like boat cutting through a thin layer of sea ice.
<u>Explanation</u>:
Alfred Lothar Wegener was a great meteorologist and German polar researcher. He was commonly known for his <u>“theory of continental drift”.
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In this theory, they proposed an idea that the continents were slowly drifting around the Earth. Many researchers objected his view. But he provided many evidence to support his continental drift hypothesis.
Some of the evidences are: Continental jigsaw puzzle, Fossils match across the seas, Rock types and geologic features and Ancient Climates.
