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pantera1 [17]
3 years ago
12

How many valence electrons do elements in group 14 have

Biology
1 answer:
Alex Ar [27]3 years ago
6 0

Answer: 4

Explanation: There are 4 valence electrons in group 14, the Carbon group.

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A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 5 million years. How many years
zubka84 [21]

Answer:

20 million years

Explanation:

If we have a neutral mutation rate of one mutation per 5 million years, then the total of eight mutation between the two different species would be 20 million years. This is because both species will have 4 mutations in those 20 million years, so combined, both by 4, will have 8 mutations between them. So few mutations on so much time will result in two species that are very similar to each other even after 20 million years of evolution, even making them hardly distinguishable, especially if it comes to defining fossil records from them both. A nice example of this are the members of the felidae (cat) family, which are all very closely related, and are almost identical, thus making it extremely hard to distinguish two species of the same or similar size by their fossils.

7 0
3 years ago
In the space provided below draw electron dot diagram's for the following atoms nitrogen ,hydrogen , oxygen ,and carbon
earnstyle [38]
Here you go. Hopefully this helps

3 0
3 years ago
The integumentary system has many functions, one of which is multiple choice production of vitamin
Korolek [52]

The answer is the detection of heat and touch. The integumentary system consists of the skin, nails, glands, hairs, and nerves. The nerves are responsible for sensing stimuli including pressure, heat, and touch. Another example of its function is acting as a physical barrier against harmful microorganisms and excretion.   


6 0
3 years ago
Parkinson disease is associated with demyelination of CNS neurons. a pyramidal nerve tract lesion. insufficient production of ac
Pepsi [2]

Answer:

The correct option is: <em>a deficiency of dopamine in the substantia nigra.</em>

Explanation:

The substantia nigra is the principal site involved in the physiopathology of Parkinson´s disease.

Cells from this area degenerate and die progressively causing important degeneration in the central nervous system. The cells that die -with no known reason- are those that produce dopamine and proportionate dopaminergic innervation to the encephalon. In fact, almost all the symptoms exhibited by patients with the disease can be explained by the lack of dopamine in the substantia nigra.  

This area uses the neurotransmitter to communicate neurons from the base ganglia. Ganglia are responsible of modulating and modifying movements.

The nigrostriatal system participates in planning and automatic execution of learned movements. When the ganglia activity decreases, so it does the amount and velocity of movements, something typical of the disease.  

3 0
2 years ago
Please answer ASAP!!
Serhud [2]
That looks right to me


4 0
3 years ago
Read 2 more answers
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