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alexdok [17]
3 years ago
12

How does natural selection provide a mechanism for evolution to occur?​

Biology
1 answer:
Troyanec [42]3 years ago
4 0

Answer:

Explanation: If resources are limited in nature than only the organisms that adapt to their surroundings will survive- Darwin's studies proved these theories.

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Degeneration of the dopamine-releasing neurons of the ________ is the ultimate cause of Parkinson's disease. Degeneration of the
slavikrds [6]

Answer:

a. substantia nigra

b. substantia nigra (it is repeated)

Explanation:

Parkinson's disease is a neurodegenerative disease that is caused by the death of neurons that release the neurotransmitter dopamine in the <u>substantia nigra</u>, or locus niger, -a region of the brain that regulates brain circuits that give the 'orders' to initiate voluntary movements- .

The lack of this neurotransmitter leads to the occurrence of the main symptoms suffered by patients: decreased movements, muscle stiffness, postural instability and tremor. These failures are generated by the abnormal way in which neurons work in the absence of dopamine through a mechanism that is not known in depth.

It is the second most frequent neurodegenerative disease, after Alzheimer's disease, with a prevalence of 2% in people over 65 years. The characteristic symptoms of stiffness, bradykinesia and tremor are associated with losses of neurons in the substantia nigra and dopamine depletion in the striatum. There are large cytoplasmic inclusions, called Lewy bodies, which are the pathological mark of the disease and appear predominantly in neurons that contain melanin of the nigra substance. Genetic studies in a subgroup of families with Parkinson's disease with autosomal dominant inheritance found a locus on chromosome 4q-21 23 and a mutation in the gene that encodes a synaptic protein, α-synuclein.

7 0
3 years ago
A healthy diet gives a ..................​
Marina CMI [18]

Answer:

What constitutes a healthy diet?

A healthy diet is one that helps maintain or improve overall health. A healthy diet provides the body with essential nutrition: fluid, macronutrients, micronutrients, and adequate calories. A healthy diet may contain fruits, vegetables, and whole grains, and includes little to no processed food and sweetened beverages.

Explanation:

8 0
3 years ago
What product produced by yeast cells during fermentation causes bread to rise?
svetlana [45]

Answer:

carbon dioxide

Explanation:

7 0
3 years ago
Read 2 more answers
Through photosynthesis a simple sugar is produced. Where do the carbon atoms come from to produce this sugar molecule?
yan [13]
They come from the atmosphere, since plants use carbon dioxide to produce carbohydrates :)
8 0
3 years ago
Which substance is considered to be a proven ergogenic aid that increases athletic performance?
fenix001 [56]

Out of the following given choices;

<span>A.      </span>Salt tablets

<span>B.      </span>Bee pollen

<span>C.      </span>Carnitine

<span>D.      </span>Coenzyme Q10

<span>E.       </span>None of the above  

The answer is D. (none of the above). These elements are found  naturally in nature and in our bodies. Coenzyme Q-10 and carnitine are found naturally in our bodies while bee pollen and salt are found naturally in our environments. Therefore, it is implausible to consider them ergogenic substances






4 0
3 years ago
Read 2 more answers
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