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Answer:

Explanation:

From the given information,

The first process is to determine the initial growth rate by using the formula:

[tex]R_o = \dfrac{In(2)}{t_d}[/tex]

where;

The initial growth rate(constant) = [tex]R_o[/tex] ; &

the doubling time = [tex]t_d[/tex] = 1 year

[tex]R_o = \dfrac{In(2)}{1 \ year}[/tex]

[tex]R_o[/tex] = 0.693 / year

Now, we move up to the net stage to find the growth constant by using the formula:

[tex]r = \dfrac{R_o}{(1 - \dfrac{N_o}{K})}[/tex]

where;

[tex]N_o[/tex] = population of fish in the pond = 100

[tex]R_o[/tex]  = The initial growth rate(constant)  = 0.693 /year

K = carrying capacity = 2000

Then;

[tex]r = \dfrac{0.693 \ /year }{(1 - \dfrac{100}{2000})}[/tex]

[tex]r = \dfrac{0.693 \ /year }{(1 - 0.05)}[/tex]

[tex]r = \dfrac{0.693 \ /year }{(0.95)}[/tex]

r = 0.730 / year

a)

Now, the maximum yield can be evaluated by using the expression:

[tex]= \dfrac{rk}{4}[/tex]

[tex]= \dfrac{0.730 \times 2000}{4}[/tex]

= 365 fish per year

Also, the maximum sustainable yield is said to be half of the carrying capacity suppose that the population growth obeys logistic curve;

i.e.

[tex]N' = \dfrac{1}{2} \times 2000[/tex]

N' = 1000 fish

b)

If the population is maintained at 1500 fish;

The sustainable yield can be calculated by using the formula:

The Sustainable yield = [tex]r\times N (1 - \dfrac{N}{K})[/tex]

The Sustainable yield = [tex](0.730/ year ) (1500) (1 - \dfrac{1500}{2000})[/tex]

The Sustainable yield = 1095 × 0.25

The Sustainable yield = 273.75 fish per year

The Sustainable yield ≅ 274 fish per year

Population size should be maintained to achieve maximum yield and Sustainable yield if population is maintained at 1,500 fish are 364.7 , 273.525 fish per year

Given that;

Stock in start = 100 fish

Double in 1 year

Capacity of pond = 2000 fish

Find:

Population size should be maintained to achieve maximum yield

Sustainable yield if population is maintained at 1,500 fish

Computation:

Growth rate = ln₂ / 1

Growth rate = 0.693 per year

With no growth constraint r = [tex]\frac{0.693}{1-\frac{100}{2000} }[/tex]

With no growth constraint r = 0.7294 per year

A. Population size should be maintained to achieve maximum yield = [tex]\frac{0.7294 \times 2000}{4}[/tex]

Population size should be maintained to achieve maximum yield = 364.7 fish per year

B. Sustainable yield if population is maintained at 1,500 fish = [tex][(0.7294))(1500)][1-\frac{1500}{2000} ][/tex]

Sustainable yield if population is maintained at 1,500 fish = 273.525 fish per year

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Answer:

eukaryatic which the RH whitthakar was divided PLANTAE and animalia kingdoms in eukaryotes

Answer:

B.

Explanation:

That's true without cells we wouldn't live.

Answer:

I cant see the question

Explanation:

Answer:

Scientific law.

Explanation:

A scientific law is a statement that the scientific community elaborates on after observing a natural phenomenon and performing several experiments concerning certain phenomena. Scientific laws aim to explain the reasons why something happens and what may cause it to predict it in the future.

Answer:

neutral atoms coming together to share electrons.

Explanation:

Answer:

The answer is neutral atoms coming together to share electrons.

Explanation:

Bc covalent compounds are compound whose atoms form bonds by sharing electrons

Have a great day!!

Answer:

Aortic Valve

Explanation:

I just know it

Answer:

Unicellular organisms- Organisms which have only single cell are called unicellular organisms.

Multicellualr organisms- Organisms with many cells are called multicellular organisms.

Answer:

multicellular organisms need organs to function properly

Explanation:

Answer:

Yes, it is. The chart shows that the initial charge of the neuron is negative. When the neuron is stimulated, sodium ions enter the cell. So, the voltage inside the cell changes to positive. When potassium ions move outward, the voltage decreases until it reaches its previous state.

Explanation:

Plato answer

Answer:

Primary succession occurs in an area with no life and no soil but secondary succession happens in an area where an existing community was disrupted.

Explanation:

Ecological succession, which is the series of changes that occurs in an ecosystem over a period of time, can be divided into two types namely: primary succession and secondary succession.

- Primary succession is a kind of succession in which a bare surface or rock is colonized by certain organisms called PIONEERS. Primary succession occurs in an area with no life and no previous soil.

- On the contrary, secondary succession occurs in an area that has been previously colonized but disturbed as a result of natural occurrences e.g earthquake, wildfire, flooding etc.

Answer:

false

Explanation:

not all cultures practice the same gender norms and ideologies

Answer:

plankton my look small but if you have a micoscope they are pretty big and no not because it is zoomed on them

Explanation:

do not question me smarts i am smart tho lot smarter then you think i am

Answer:

Your answer is B) Batoidea. Batoidea is a superorder of cartilaginous fishes commonly known as rays.

Answer:

b because the guy above me said so

Answer:

no

Explanation:

though the waves of the graph are same but it is not constant because the waves goes down and up again. we know constant is what goes without falling down or climbing up.

Answer:

Explanation:Energy flow and nutrient circulation are the major functions of the ecosystem.

Energy is lost as heat forever in terms of the usefulness of the system. On the other hand, nutrients of food matter never get used up. They can be recycled again and again indefinitely.

Carbon, hydrogen, oxygen, nitrogen and phosphorus as elements and compounds makeup 97% of the mass of our bodies and are more than 95% of the mass of all living organisms.

In addition to these, about 15 to 25 other elements are needed in some form for the survival and good health of plants and animals.

These elements or mineral nutrients are always in circulation moving from non-living to living and then back to the non-living components of the ecosystem in a more or less circular fashion.

This circular fashion is known as biogeochemical cycling (bio for living; geo for atmosphere).

Among the most important nutrient cycles are the carbon nutrient cycle and the nitrogen nutrient cycle.

There are many other nutrient cycles that are important in ecology, including a large number of trace mineral nutrient cycles.

Explanation:

base on the person opinion

Answer:

i think it's the first one

The answer is B. a decrease in air pollution.

Answer: No. Hydrotropism is caused by water

Explanation:

Answer:

a is your answer

Explanation:

The effect that the average population growth would have on land usage, considering the given graph is that: Option D.

Urban land use can be described as the level of activities reflected by a location which involves the following:

Urban land use increases, normally, as population increases. From the graph shown, the purple line shows urban land use increased above 30%.

Therefore, the effect that the average population growth would have on land usage, considering the given graph is that: Option D.

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Answer:

Urban use of land rises to more than 30 percent of available land

Explanation:

Answer:

Eblow is a terrible thing.

Explanation:

Answer:

I think its, option b) Viruses are not living organisms, but bacteria are living.

Explanation:

The other options don't fit "summarize the differences b/w bacteria and virus", or simply don't make sense...  

Bacteria can replicate as well, not only virus, so that cannot be a difference

The virus is often the one being more dangerous, there is something called "good bacteria"

A virus isn't  living, (for the sake of this answer), and we all know for sure that bacteria is living

So, that's how option b is correct

I hope this helped you!!

Answer:

It helps them to focus

Explanation:

some people focus better when listening to music

Answer:

For some students it can help and for some it cant

Explanation:

Answer:

conduction?

Explanation:

Answer:

anticyclone/2nd one down

Answer:protection from other predators.

Explanation: the quills will stick into a predator that attack the porcupine Note: it does NOT shoot its quills

Answer: protection from other predators.

Answer:

Flowers and cones have different structures. Cones when mature have a woody texture and is made up of scales while flowers have colorful petals, sepals and both male and female reproductive portions are called stamens and pistils.

Explanation:

Answer:

the other side of a cone

Explanation:

Answer:

It is typhoid. typhoid is not a viral disease

Answer:

Typhoid is not a viral disease.

Explanation:

Viral diseases are spread through virus particles, while typhoid is spread from typhi bacteria.

Answer:

Plants absorb water from the soil. The water moves from the roots through the stems to the leaves. Once water reaches the leaves, some of it evaporates from the leaves, adding to the amount of water vapor in the air. This process of evaporation through plant leaves is called transpiration.

I really hope this helps!

Plants contribute to the water cycle in several ways through Transpiration, evaporation, Precipitation: and infiltration.

Plants take in water through their roots and transport it up to their leaves. As water evaporates from the leaves, it creates a force that pulls more water up from the roots through a process called transpiration, and it is a major way that water moves through the atmosphere.

Water from plants and soil also evaporates into the atmosphere. This process is called evaporation, and it is another important way that water moves through the water cycle.

When water vapor in the atmosphere cools, it condenses and falls back to Earth as precipitation. This can be in the form of rain, snow, sleet, or hail.

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Answer:

Explanation: I tried to use the answer that was on there and it was wrong so I got that answer wrong luckily it tells the the correct answer

Answer: Answer is explained below.

Explanation:

Solar system formation put in order:

Hope this helps someone. Good luck everyone!  

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