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olchik [2.2K]
3 years ago
12

What is strategic mineral?

Biology
1 answer:
Umnica [9.8K]3 years ago
4 0
C) one that must be imported to the U.S. 
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LL

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dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, an
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The correct option is D, that is, THEIR FUNDAMENTAL NICHE HAS BEEN COMPROMISED.

Explanation:

From the information given in the question, we are told that the expanses of the Great Plains, which was once occupied by the prairie dogs have been reduced in size due to increased housing and agricultural developments. This implies that, the habitat, which is natural to the prairie dogs has been reduced in size, in another word, their fundamental niche has been compromised.                                                                                                                                                      

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As population density , competition increases.
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As population density increases, competition increases because there are more organisms competing for the same number of resources
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The first stage in the formation of coal is
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First stage is peat, then followed by lignite, bituminous and anthracite. Mark as branliest tq
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Parkinson’s disease is a progressive disorder that is caused by degeneration of nerve cells in the part of the brain called the
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The Parkinson´s prevalence is 60,000 diagnosed cases per year, with an estimate of 1-1.5 million Americans ill,  and the incidence is 18,000 deaths (2003), affecting mostly after the age of 55, but sometimes 30 and 40.

Explanation:

The common symptoms include  involuntary tremor in hands, arms, legs and jaw , muscle stiffness arms, shoulders or neck , gradual loss of movement which often leads to decreased mental skills, changes in voice and facial expression as blinking, swallowing and drooling , stooped posture, unsteady balance  and dementia.

Unfortunately the regular diagnosis methods such as  X-ray or blood test, are not suitable to confirm this disease, only conventional methods such as  two of the three symptoms found in the patient, no more neurological signs found, exclude the tranquilizer medications, head trauma or stroke  patients´usage and try levodopa, dopamine agonists, COMT inhibitors, selegiline, anticholinergic medications or amantadine, which are Parkinson's medication, only to relieve the symptoms, by stimulating the remaining cells in the substantia nigra to increase the levels of dopamine or by decreasing the acetylcholine produced.

Procedures such as surgery, pallidotomy, thalamotomy, and deep brain stimulation are also available procedures to help Parkinson´s extreme symptoms.

On going experimental research  on embryonic stem cells, although political and ethical controversial, might enable scientists to produce dopamine neurons in the laboratory for transplantation into humans offering hope for Parkinson's cure in the future.

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