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xz_007 [3.2K]
3 years ago
15

How do the Earth’s physical factors influence population density? When population growth increases in an area, what is happening

to the birth rate and age structure of that population?
Biology
1 answer:
aev [14]3 years ago
7 0

Answer:

question 1:

  • both the number of species and population density decreases as altitude above sea level increases

question 2:

increase in birth rate => greater number of young organisms

Explanation:

As altitude above sea level increases, O2 density decreases, the amount of UV rays increases and the difference between daytime and nighttime temperature increases

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WILL MARK BRAINLIEST!
Harlamova29_29 [7]

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Explanation:

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2 years ago
In a population of 200, 86 individuals express the recessive phenotype. What percent of the population would you predict would b
Nitella [24]

Answer:

The correct option is;

D. 45%

Explanation:

From the Hardy- Weinberg law, we have;

p² + 2·p·q + q² = 1

p + q = 1

Where:

p = Dom inant allele frequency in the population

q = Recessive allele frequency in the population

p² = The percentage of individuals in the population that are hom ozygous dominant

q² = The percentage of individuals in the population that are homo zygous recessive

2×p×q = The percentage of hete rozyous individuals in the population

The number of individuals that express the recessive phenotype = 86

The number of individuals in the population = 200

The percentage of  individuals that express the recessive phenotype, q² = 86/200 = 0.43

Therefore;

q = √0.43 = 0.656

p + q = 1

p = 1 - q = 1 - 0.656= 0.344

∴ The frequency of  individuals that express the do minant phe notype, p = 0.344

The percentage of heterozyous individuals in the population = 2×p×q × 100 = 2 × 0.656 × 0.344 × 100 = 45.15% ≈ 45%

3 0
3 years ago
What is a natural depression filled with standing freshwater called giving brainliest
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Answer:

B:A Pond

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4 0
3 years ago
2. Give ONE possible reason, biotic or abiotic, why the population decreased in 1990
klemol [59]

Answer:

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Availability of resources is abiotic factor which is responsible for the decrease in population in 1990 because when the population reaches its carrying capacity so the organisms compete with each other and due to limited resources such as food etc the decrease occurs in population. Infection is also occurs when there is high population due to which death occurs and population of organism decreases.

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2 years ago
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