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vladimir2022 [97]
3 years ago
13

Dark energy has been hypothesized to exist in order to explain:

Biology
1 answer:
kykrilka [37]3 years ago
4 0
Dark Energy explains:
How groups of objects function together, and also to keep the universe expanding
Hope this helped.
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which of the 4 macromolecules consist of a variety of units and can be divided into 2 classes?? Helpp!!
Dima020 [189]

Answer:

The 4 macromolecules are nucleic acids, carbohydrates, proteins, and lipids.

structure: Carbohydrates, lipid, and protein

Function: Nucleic acids, Carbohydrates, Lipid, and Protein

Explanation:

6 0
2 years ago
In 1985 a biologist counted 750 pine trees in a 250 hectare forest. Using similar counting techniques, the biologist counted 1,2
Alisiya [41]

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

7 0
3 years ago
The tough membrane that surrounds the shaft of the bone is the​
Alex73 [517]

Answer: periosteum i think that is what it is called not sure but probalbly correct

Explanation:

8 0
3 years ago
Read 2 more answers
Which of the following is not a domain in the three domain system?
Veseljchak [2.6K]
B is not one of the three domains of life
4 0
3 years ago
Read 2 more answers
Part B What are two strengths and two weaknesses of your model?
Fiesta28 [93]

Answer:

strength: it provides raw material for plants and major component of food.

weaknesses: it increases earth's temperature and change the habitat.

Explanation:

The diagram shows the carbon cycle which is important cycle present on the earth. This carbon is present in carbondioxide form which is used as a raw material by plants in order to make their own food. This carbon is also present in different organic compounds. When its concentration increases in the atmosphere, the temperature of the atmosphere increases and many areas are not suitable to live for many plants and animals.

3 0
2 years ago
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