Why should humans be concerned about rarity of species, not just extinction rates?.

1 answer:

7 0

Because we coexist in ecosystems with rare species and depend on them for our existence and quality of life, we should be worried about the rarity of species.

The entire group of organisms and the natural setting in which they live together make up an ecosystem. Through nutrient cycles and energy exchanges, these biotic and abiotic elements are interconnected. Through photosynthesis, energy enters the system and is absorbed into plant tissue. Animals are crucial in the transport of matter and energy through the system because they consume plants and one another for food. They also have an impact on the biomass levels of microorganisms and plants.

Decomposers are organisms that break down dead organic matter, releasing carbon into the atmosphere and facilitating nutrient cycling by transforming nutrients held in dead biomass into forms that are easily utilizable by plants and microorganisms. External and internal influences affect ecosystems in different ways.

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An individual is now 50 years old, that he plans to retire in 10 years, and that he expects to live for 25 years after he retire

Nutka1998 [239]

Answer:

Ans. He must save during each of the following 10 years, at the end of each year $32,452.

Explanation:

Hi, in order to find the amount of money that he should have in ten years so he can receive an annual payment of $65,156 for 25 more years (24 payments), we need to bring to present value all 24 payments to year 10. Let me show you the formula.

$PresentValue_{10} =\frac{A((1+r)^{n}-1) }{r(1+r)^{n} }$

Where:

A= $65,156

n= 24

r= 0.08

Therefore the present value in year 10 is:

$PresentValue_{10} =\frac{65,156((1+0.08)^{24}-1) }{0.08(1+0.08)^{24} }=686,012$

So that is our present value in year 10, or to put it in other words, our future value (if we look at it from year 0). Now we need to find the annuity (amount to save) that with account for $686,012, plus that $100,000 that he already has saved.

Every should look like this.

$686,012=100,000*(1+0.08)^{10} +\frac{A((1+0.08)^{10}-1) }{0.08(1+0.08)^{10} }$