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nekit [7.7K]
3 years ago
8

Andrew is describing the water cycle in three steps, as shown in this simple model. Which statement belongs in the third region?

Biology
2 answers:
stira [4]3 years ago
4 0
A. Water falls from the atmosphere as rain, ice, or snow
vampirchik [111]3 years ago
3 0

Answer:

A. Water falls from the atmosphere as rain, ice, or snow.

Explanation:

Water cycle is the term that refers to the continuous movement of water through physical and chemical changes through living beings in the ecosystem. This cycle allows water to pass through the atmosphere, hydrosphere, lithosphere and biosphere, in an uninterrupted movement.

The water cycle begins when the water present in rivers, lakes and oceans begins to evaporate due to the heat of the sun. At that moment, the water changes from its liquid form to its gaseous form and remains in the atmosphere until it is captured by the clouds. At that moment, the clouds allow the vapor to condense and turn back into liquid water that will be released from the clouds in the form of rain, ice or snow. In this way, the water returns to the oceans, rivers and lakes, in addition to being stored in deep soil layers.

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In 1985 a biologist counted 750 pine trees in a 250 hectare forest. Using similar counting techniques, the biologist counted 1,2
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Answer:

Suppose that we have a given function f(x)

The average rate of change of the function between two values x₁ and x₂ is given by:

r = \frac{f(x_2) - f(x_1)}{x_2 - x_1}

a) We want to find the average (rate) of change on the size of population from 1985 to 1995.

We have that:

f(1985) = 750

f(1995) = 1500

Then we have:

r = \frac{1500 - 750}{1995 - 1985}  = 750/10 = 75

This means that the population of trees increases, in average, at a rate of 75 trees per year.

b) What is the density of trees each year that they were counted?

This will be equal to the quotient between the number of trees and the area.

1985: number of trees = 750 pines

         area = 250 ha

Then the density is:

D(1985) = (750 pines)/(250 ha) = 3 pines/ha

So 1985, there were 3 pines per hectare.

1990: number of trees = 1250 pines

         area = 250 ha

Then the density is:

D(1990) = (1250 pines)/(250 ha) = 5 pines/ha

1995: number of trees = 1500 pines

         area = 250 ha

The density is:

D(1995) = (1500 pines)/(250 ha) = 6 pines/ha

3) now we want to get the average change between 1985 and 1995 in the density, this will be:

r = \frac{D(1995) - D(1885)}{1995 - 1985}  = \frac{6 pines/ha - 3pines/ha}{10}  = 0.3 pines/ha

So, on average, each year the number of pines per hectare increases by 0.3

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