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Rashid [163]
3 years ago
7

Which of the following includes the development of plaque and tangles in the brain? (2 points)

Biology
2 answers:
svlad2 [7]3 years ago
7 0
It's alzheimer's disease 
aleksklad [387]3 years ago
4 0

The answer is D) Alzheimer's Disease

I took the quiz and this is the correct answer. :)

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in which of the following substances is a plant more likely to fossilize a)mud b)sand c)gravel d)magma
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I'm not sure, but I think it would be mud.
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See picture below!!!!!! :D
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Which type of selection tends to increase genetic variation? A. Disruptive selection B. Directional selection C. Stabilizing sel
aliina [53]

Answer:

Which type of selection tends to increase genetic variation? A. Disruptive selection B. Directional selection C. Stabilizing selection

The Answer is option A (Disruptive selection)

Explanation:

Selection can either shift the mean value of a trait, reduce the trait's variation, or increase its variation.

Genetic variation which allows natural selection to increase or decrease frequency of alleles already in the population is a source of phenotypic variation as it refers to differences in all the hereditary information of members of the same species.

Disruptive Selection is important in maintaining variation and initiating speciation as it Increases Variation by favoring alleles corresponding to more extreme phenotypes. But for it to occur, the mean phenotype has to experience the lowest fitness. Disruptive selection affects the frequency distributions of alleles and genotypes within a population.

Disruptive selection is based on the variance of a trait in a population as it increases genetic variance by equalizing the frequencies of existing alleles at polymorphic loci (a genetic loci with two or more alleles). Disruptive selection maintains and may even increase variation in natural populations by favoring extreme phenotypes, individuals with extreme values for a trait have greater reproductive success than individuals with intermediate values.

7 0
3 years ago
Surface currents in the Northern Hemisphere rotate in a _______ direction. In the Southern Hemisphere, the surface currents rota
trapecia [35]

Explanation:

Surface currents in the Northern Hemisphere rotate in a Clockwise direction whereas in  the Southern Hemisphere, the surface currents rotate in a anticlockwise direction. This happens because of the Coriolis effect, because of this Coriolis effect surface currents are shifted to angle of 45°. Therefore, it deflects the current towards right in northern hemisphere and towards left in southern hemisphere.

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