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3 years ago

How much mass does a fetus gain from 0 to 8 weeks of development?

Biology

2 answers:

KengaRu [80]3 years ago

7 0

Answer:

The answer is that the fetus does not gain mass from week zero until the eighth week. The fetus begins to gain mass from the tenth week, with an approximate weight of 5 grams and an approximate size of 3.4 centimeters.

Explanation:

Ultrasound scans are used to report the size and approximate weight of the baby. The size of the fetus increases in a linear way, more or less similar size every week, the weight does so exponentially, that is, it increases in weight during the first months and gains most in the last third of pregnancy.

SpyIntel [72]3 years ago

3 0

Like an ounce or two

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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)

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

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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3 years ago