How does pollution cause a reduction in biodiversity?

1 answer:

3 0

human activity influences the natural environment producing negative, direct or indirect, effects that alter the flow of energy, the chemical and physical constitution of the environment and abundance of the species.

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For a particular species of wolf, 55% are female, 20% hunt in medium-sized packs, and 15% are both female and hunt in medium-siz

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*Given
Percent of the wolves which are female - 55%
Percent of the wolves which hunt
in medium-sized packs - 20%
Percent of the wolves which are both
female and hunt in medium-sized
packs - 15%

*Solution

Assuming that there is a total of one hundred wolves in the species, 

1. Since percent (%) means "per 100" or "for every 100" then,

a. The number of female wolves is

(55 female wolves / 100 wolves) * 100 wolves total = 55 female wolves

b. The number of wolves that hunt in medium-sized packs is

(20 wolves / 100 wolves) * 100 wolves total = 20 wolves

Note that the 20 wolves is a mixture of male and female wolves.

c. The number of female wolves that hunt in medium-sized packs is

(15 female wolves / 100 wolves) * 100 wolves total = 15 female wolves

2. Because there is a total of 55 female wolves in the species, and 15 of these wolves hunt in medium-sized packs, then the number of female wolves that do not hunt in medium-sized packs is,

55 female wolves total - 15 female wolves hunting = 40 female wolves not
in medium-sized packs hunting in medium
sized packs

3. To find the proportion, we can express the answer in terms of percent (%) or in fraction, which is usually how proportions are expressed.

For every 100 wolves, there are 40 female wolves that do not hunt in medium-sized packs. This can be expressed as a proportion of

 40 
 100

and simplified by dividing both the numerator and denominator by 10, we get,

 40/10 
 100/10

 4 
 10

When this is expressed in percent, we multiply the fraction or proportion by 100% to get,

 4 x 100% = 40%
 10

Thus, the proportion of female wolves that do not hunt in medium sized packs is 4/10 or 0.4. When expressed as percent, this is 40%.

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