We might connect more with our local watersheds.

We might connect more with the water embedded in our daily lives (in everything we do and consume).

We might meet our increasing water demands through conservation, rather than seeking additional supply.

We might rethink how we manage dams on our major rivers.

We might connect more with our local watersheds.

We might connect more with the water embedded in our daily lives (in everything we do and consume).

We might meet our increasing water demands through conservation, rather than seeking additional supply.

We might rethink how we manage dams on our major rivers.

We might connect more with our local watersheds.

We might connect more with the water embedded in our daily lives (in everything we do and consume).

We might meet our increasing water demands through conservation, rather than seeking additional supply.

We might rethink how we manage dams on our major rivers.

We might connect more with our local watersheds.

We might connect more with the water embedded in our daily lives (in everything we do and consume).

We might meet our increasing water demands through conservation, rather than seeking additional supply.

We might rethink how we manage dams on our major rivers.

Please give me these 15 questions’ answers within 1 hour. Please make sure the quality.

1. Endocrine Disruptors are a class of toxicants that can elicit sublethal effects at very low concentrations because the hormones they interfere with are normally present in very low concentrations.

TRUE or FALSE?

 

True

False

2.Calculating LC50/LD50 from a dose-response curve provides a measure of acute response to a toxicant.

TRUE or FALSE?

 

True

False

3. In a lecture, I described a study in which the researchers tested urine samples from more than 2,500 U.S. citizens to determine exposure to bisphenol-A (BPA).

What did the researchers (Calafet et al., 2007) conclude about the U.S. population’s exposure to BPA?

Select the best answer below.

A.	Exposure is acute & Exposure is much higher for adults than for babies.

B.	Exposure is acute & Exposure is much higher for babies than for adults.

C.	Exposure is chronic & Exposure is much higher for babies than for adults.

D.	Exposure is chronic & Exposure is much higher for adults than for babies.

4. TRUE or FALSE?

Once a toxicant degrades, the threat of toxicity is gone.

True

False

5. Living organisms are often simultaneously exposed to more than one chemical, and you can’t always predict the magnitude of the response to 2 chemicals by simply adding together the predicted responses to each of the chemicals.

In other words, the interaction effect between two stressors is usually not as simple as combining the effects of the stressors … 1 + 1 does not always equal 2.

The type and magnitude of response to exposure varies depending, in part, on which chemicals are combined.

Imagine a scenario in which spotted salamanders were exposed to 2 chemicals (chemA and chemB) whose typical individual effects are well studied. The salamanders’ response to a mixture of chemA+chemB, however, was much lower than predicted based on known responses to each of these chemicals. In this hypothetical scenario, the salamanders exhibited a(n) _____________ response to the mixture of chemA and chemB.

A.	synergistic

B.	antagonistic

C.

additive

6. Mercury (Hg) is known to bioaccumulate in the tissue of organisms, and to biomagnify in the food chain.

For our example, let’s assume the following:

(1) there is a simplified food chain of:

Algae –> Zooplankton –> Trout –> Osprey

(2) Mercury (Hg) magnifies by x10 per trophic level

(3) the Mercury level (mmHg) of the algae is 1.3 mmHg

(algae are primary producers)

Based on the information provided, calculate the Mercury level (in units of mmHg) of a person who routinely consumes trout from this lake.

A

130 mmHg

B

13 mmHg

C

1300 mmHg

D

1.3 mmHg

7. Cultural eutrophication and dead zones result from a(n) _______________ in the water.

A	deficiency of symbiotic algae

B	excess of nutrients (fertilizers)

C	deficiency of limiting minerals

D	excess of synthetic pesticides

8. Recall my lecture about Human Population Growth, and choose the best answer to complete the following sentence.

Worldwide, one of the absolute best predictors of Fertility (the actual number of births per female in her lifetime) is ___________________.

A	access to 1980s TV sitcoms

B	desired family size

C	availability of fresh water

D	replacement fertility rate

9. What characteristic of environmental systems explains how it is possible that the human population could exceed Carrying Capacity, but not realize it until much later?

Select the best answer from the options below.

A	feedback loops

B

lag time

C	leverage points

D

entropy

10. In a lecture, I shared several approaches for measuring the impact of human populations on the environment (on natural resources). Recalling that lecture… Which of these approaches incorporates the resources required to assimilate our wastes, in addition to consumption of resources for goods and services?

A	Human Appropriation of NPP

B	IPAT Equation

C	Ecological Footprint

11. As woods and meadows are converted to cropping systems, residential areas, and urban districts, what generally happens to rates of runoff and infiltration?

Select the best pair of answers.

A	runoff increases, infiltration decreases

B	runoff increases, infiltration increases

C	runoff decreases, infiltration decreases

D	runoff decreases, infiltration increases

12. In multiple lectures, I have articulated that our overconsumption and/or degradation (i.e., unsustainable use) of some technically renewable resources can make those resources effectively nonrenewable.

Which of the following resources fall into this category of “renewable resources in danger of becoming effectively nonrenewable“?

Select any and all that apply.

A	groundwater

B	natural gas

C

topsoil

D

petroleum

13. In lecture, you learned about “fishing down the food web.”

Which of the following is the primary cause of this phenomenon?

Choose the best answer from the list below.

A	strong dietary preferences for certain fish species

B	shellfish migrating to deeper ocean depths

C	conventional aquaculture methods

D	scarcity of fish occupying lower trophic levels

14. Aquaponics technology was one of the main contributions of the Green Revolution.

TRUE or FALSE?

True

False

15. In her talk, Sandra Postel described what she believes would happen if we place water, and its fundamental role as the basis of all life on earth, at the core of everything we do. Which of the following are among the outcomes she described?

Select any and all that apply.

A.	We might connect more with our local watersheds.

B.	We might connect more with the water embedded in our daily lives (in everything we do and consume).

C.	We might meet our increasing water demands through conservation, rather than seeking additional supply.

D.	We might rethink how we manage dams on our major rivers.