B. the carbon cycle ensures living things have a source of hydrogen
Polycythemia is defined an abnormal increase in the number of circulating red blood cells. It is mainly caused by a cancerous condition known as myeloproliferative disorder or due to a low supply of oxygen to body tissues usually due to living in high altitude areas and the body tries to compensate by producing more red blood cells to increase oxygen carrying capacity of the blood
Normal blood count values in a male adult is 4.7 to 6.1 million cells/mcL, while in a female adult it is 4.2 to 5.4 million cell/mcL.
If this blood cell count is significantly higher then these values, and remains there or continues to rise, over a given period of time, accompanied with some specific symptoms, then polycythemia is suspected.
The best example of erosion would be the deepening of a stream bed by pebbles rolling along the bottom of the stream.
<h3>What is erosion?</h3>
It is a process that leads to the removal of soil, rocks, or any other material by the action of water, wind, or ice.
Erosion is opposed to weathering which happens to be the breakdown or the dissolution of materials by agents of weathering.
Thus, breaking of shale, dissolving of rock particles, and crumbling of bedrock are all weathering processes while the deepening of a stream by pebbles rolling along the bottom of the stream exemplifies an erosion.
More on erosions can be found here: brainly.com/question/3852201
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Answer:
A. Those continents were once a part of one supercontinent.
Explanation:
This so called supercontinent is called Pangea, which existed during the late Paleozoic and early Mesozoic eras, and assembled approximately 335 million years ago, which began to break apart about 175 million years ago.
