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11 May 2019

How do you feel about the impact of humans on fish populations?

Do you feel that Dave's experimental evidence could be shown in larger populations?

Do you think we should just stop fishing?

What are some ways in which we currently manage fish stocks in the North Atlantic?

How do you think we could manage a fish stock like bluefish, that migrate from South America to Canada?

What is another solution to the proposed problem of smaller fish? What are the advantages and disadvantages to that solution?

Do you need further evidence to support that humans are impacting fish size? Why? Why not?

Explain how human selection on fish is impacting fecundity.

What are the requirements for selection (any type)? How does fecundity impact the ability of fish populations to meet these requirements?

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12 May 2019

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Related questions

1.What is an ecological footprint? What is the greatestcontribution that you make to your footprint? How could you reduceit?

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greywasp586

Select the statements that correctly represent the theory ofevolution. Select all that apply.

Evolution is partly about inheritance. Evidence of evolution isseen in structures such as wisdom teeth and the tail bone inhumans. These structures are thought to be âleft overâ from ourancestors and no longer appear to have any essential function inmodern humans.

Natural selection means that todayâs organisms are perfectlyadapted after millions of years of fine-tuning. No further changesare necessary because of all the progress that has been made bynatural selection.

We can see evidence of past natural selection in adaptationssuch as the camouflage of moths perched on the bark of their hosttree. We can also see natural selection at work today if we trackhow populations change in rapidly changing environments.

The theory of evolution does not apply to life today. It isstrictly about the history of life: what happened in the past asseen in fossils.

Scientists disagree about the main ideas of evolutionary theorybecause of incomplete or conflicting evidence.

Question 2

Select one answer.

10 points

The ability or tendency of organisms and cells to maintainstable internal conditions is called

metabolism

homeostasis

emergent property

evolution

Question 3

Select one answer.

10 points

Why do organisms maintain fairly steady conditions within theircells and bodies?

They need to keep conditions stable so that they can obtainfood.

Organisms just change along with whatever is happening in theoutside world, which is usually quite steady.

They must maintain stable conditions to keep their enzymesworking and generally to enable the chemical reactions of life.

Unstable conditions will destroy the DNA in cells; this is themost important risk for a cell facing physical or chemicalstress.

Question 4

Select one answer.

10 points

An organism or cell exhibits ____________ when it maintainssteady internal conditions despite changes in the outerenvironment.

homeostasis

evolution

balance

natural selection

Question 5

Select one answer.

10 points

Which type of molecule best illustrates the very strongrelationship between structure and function in biology?

enzymes

oxygen gas

all kinds of organic matter

water

Question 6

Select one answer.

10 points

Which best expresses how nutrients and energy move throughlife?

Nutrients flow from sunlight to organic matter to heat. Energycycles among all life forms.

Nutrients cycle among all life forms. Energy flows from sunlightto chemical energy to heat.

Nutrients and energy both are continually recycled in a greatcircle of life.

Question 7

Select one answer.

10 points

Which of the following is not a recurring theme in biology?

Living organisms maintain homeostasis.

Energy flows through living systems while matter isrecycled.

Evolutionary processes explain both the unity and adaptivediversity of life.

All of these are recurring themes.

Question 8

Select one answer.

10 points

Which statement about evolution is FALSE?

According to evolutionary theory, you are related to abacterium, to a yeast cell, to a snake, and to a whale. In fact,you are related to every species now alive on Earth, and to fossilspecies like dinosaurs as well.

Evolution occurs constantly, without end; there is no endpointin evolution.

Natural selection acts on genetic differences within apopulation to cause evolution. Individuals do not evolve.

Natural selection is about slow but steady progress. Through it,populations constantly get better-adapted. When this process iscompleted for all populations, evolution will come to a stop.

Question 9

Select one answer.

10 points

Imagine you have a peanut butter sandwich in front of you. Thesandwich is an example of _______.

matter

energy

Question 10

Select one answer.

10 points

You provide your gut bacteria with a warm place to live. Theyprovide you with vitamins and other services. This most directlyrepresents an example of...

shared ancestry of all life

natural selection

homeostasis

interdependence of life

Plant and animal products are always renewable resources.

True

False

Question 2

Select one answer.

10 points

Human activities are the only factors that can influence theEarthâs climate.

True

False

Question 3

Select one answer.

10 points

The following are estimates from the U.S. Census BureauâsInternational Database. They are averages for populations in twodifferent groups of countries in 2012.

Group A: Total fertility 1.6 births per womanover a lifetime, life expectancy 78 years at birth, and populationgrowth rate 0.3 % per year.

Group B: Total fertility 2.6 births per womanover a lifetime, life expectancy 66 years at birth, and populationgrowth rate 1.3 % per year.

Which group do you think are the less developed countries,including most of Africa, Asia, and Latin America?

Group A nations are the less developed (lower income)nations.

Group B nations are the less developed (lower income)nations.

Question 4

Select one answer.

10 points

Which two activities are the main human activities that have ledto increased levels of atmospheric carbon dioxide (CO2)?

breathing and decomposition

burning fossil fuels and clearing forests

livestock production and rice paddy agriculture

fertilizer use and natural gas extraction

Question 5

Select one answer.

10 points

Which option lists three important greenhouse gases?

O3 (ozone), CFCs, and SO2 (sulfur dioxide)

nitrogen gas (N2), oxygen gas (O2), and carbon dioxide (CO2)

carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O)

Question 6

Select one answer.

10 points

Which best Starting in the 1950s, populations of Atlantic codwere heavily fished by highly efficient commercial trawlers.Catches started to decline in the 1970s and by 1990 several of thefisheries were completely depleted. Was the cod population arenewable resource when fished at that level? how impact changeswith development of technology?

Yes; plant and animal populations are always renewableresources.

No, because growth and reproduction of the fish couldnât keep upwith the harvest.

Question 7

Select one answer.

10 points

In a warming world, seasonal events are occurring earlier inspring and later in fall. Is this a significant problem?

Yes, because species respond differently. This can lead tomismatches between the life cycles of plants and pollinators,predators and prey, etc.

No, because all species are responding in the same way. Thegrowing season is longer, so species are likely to benefit fromthis change.

Question 8

Select one answer.

10 points

Which of the following is renewable and biodegradable?

A plastic flip-flop

A metal knife

A wooden Popsicle stick

A glass window

None of the above

Question 9

Select one answer.

10 points

What is biodiversity?

The variety of ecosystem types present within a region

Variation within a populationâs or speciesâ gene pool

The variety of life at all levels, including all of the otheroptions

Question 10

Select all that apply.

10 points

Which of the following are common benefits that humans get fromfunctioning natural ecosystems and the biodiversity that is foundthere? Select all that apply.

Grasslands and wetlands produce corn, wheat, rice and othergrain crops.

Forests prevent landslides and help protect coastlines fromstorm surges and tsunamis.

Most natural ecosystem types provide recreational opportunitiesfor hiking, wildlife watching, hunting, fishing, etc.

Mosquitoes and other disease vectors inhabit natural wetlandsand forests.

Diverse species contain countless biomolecules that may be usedas drugs or for other purposes.

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