Question

1. Define the characteristics that make some pesticidesparrticularly dangerous pollutants.

2. Describe what is meant by "the demographic transition" in ahuman population. Explain why it might be important, for futuremanagement of himan population growth, to discover wheter thedemographic transition is an academic ideal or a process throughwhich all human populations necessarily pass.

3. Energy cannot be cycled and refused but matter can. Discussthis assertion and its significance for ecosystem functioning.

4. Explain, with examples, how the loss or introduction of asingle species can have conservation consequences throughout awhile ecological community.