700 ng/g wet weight 15 ng/g wet weight 0.000023 ng/g 25. The photo above depicts

Question

700 ng/g wet weight 15 ng/g wet weight 0.000023 ng/g 25. The photo above depicts the concentrations of a type of chemical pollutant in the water (bottom @ .0000 following statements does NOT apply? (note: ng-nanogram, a unit of concentration) 23ng/g), in zooplankton (@15ng/g), and in two species of fish. Which of the A. B. C. D. The chemical is probably biodegradable in the water. This is an example of biological magnification. It is likely that this chemical persists in the environment. It is likely that this type of chemical is soluble in the fat tissues of organisms that ingest it. 26. A population of crickets shows trait variation in body length from 20 mm to 40 mm. If a nevw predator that eats crickets less than 30 mm in length is introduced into the cricket's A. There will be no effect on the cricket population. B. Th C. The cricket population will mutate in order to evolve a "longer" phenotype. D. The environment and natural selection will favor crickets 20-30 mm in length. E. The environment and natural selection will favor crickets 30-40 mm in length. e cricket population is likely to be completely eliminated. 27. Which of the following statements is NOT TRUE regarding greenhouse gases (GHGs)? A. GHGs absorb heat radiated from the Earth in the atmosphere B. GHGs may come from either human activities or natural sources. C. GHGs eventually make plants grow year-round, just like in a greenhouse. D. GHGs have helped to maintain livable temperatures on Earth. E. H2O vapor, CO2. and CHs (methane) are all GHGs. Co is the primary GHG that is studied most frequently. All of the following are rea CO2 accounts for the most GHG emissions in the atmosphere. B. Human activities such as the burning of fossil fuels, are contributing to EXCEPT A. CO2 in the atmosphere. C. Human activities, such as deforestation are adding more CO2 to the a . Earth's temperatures and CO2 levels have been highly correlated th history. Changes in atmospheric Co2 levels have always been associated activities

Explanation / Answer

25) option a - This type of chemical is probably biodegradable in water.

The diagram shown in the question is of bio magnification and this type of chemicals are non biodegradable so option a is false.

26) option e- The environment and natural selection will favour crickets 30-40 mm in length

since the predator eats crickets less than 30 mm and due to variation only 20-40 mm of crickets are there so because of both the factors only crickets with 30-40 mm will survive.

27) option d- GHGs have helped to maintain livable temperatures on earth.

except d, all is true about green house gases.

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