Question

which group of fish will most likely be affected by the toxic chemicals first?
fish at location a
fish at location b.
all the fish in the lake will be affected at the same time.
after the factory has been open for a few months and has been continuously dumping toxic chemicals into the lake, you measure the concentration of these chemicals at various locations within the lake. how will the concentrations of toxic chemicals in the lake differ at locations a and b?
high at b, lower at a
same at a and b
high at a, lower at b.
high at a, zero at b.
eventually a group of students from a nearby school succeed in pressuring authorities to stop the factory from dumping any more chemicals in the lake. however, they do not devote any money or resources to cleaning out the chemicals that have already been dumped into the lake. after a few more months, you measure the concentrations of the chemicals again at various locations within the lake. how will the concentrations of chemicals in the lake differ at locations a and b?
high at a, lower at b
same at a and b
zero at a and b
high at b, lower at a

Explanation:

First Question

Step1: Consider proximity to source

Toxic chemicals are dumped near location A. Fish at A are closest initially.

Second Question

Step1: Assume chemical diffusion

After continuous dumping, chemicals diffuse throughout the lake. So concentrations at A and B become same.

Third Question

Step1: Assume no cleaning but diffusion

Since no cleaning and chemicals diffuse, concentrations remain same at A and B (no new dumping but already - diffused chemicals still present).

Answer:

First question: Fish at location A.
Second question: Same at A and B.
Third question: Same at A and B.