4. The most important economic factor for commercial fisheries is profitability - this is the difference between the money that the fishermen can sell their catch for, and the cost of
fishing. Can you think of some of the costs of fishing, and why do you think that the rules in
our study will help to reduce these costs:
5. If the science is so clear about the economic benefits of sustainable fishing, why are fishers
not going for it? Why are they not willing to catch less for 2-3 years, to help the fish recover, if
thereafter they can catch substantially more forever? Why do you think are managers and
politicians not helping fishers to make the transition?

Scientist: cross-sections of stalactites—calcite formations deposited on cave ceilings by seeping water—can reveal annual variations in rainfall in particular areas over hundreds and thousands of years. we often found that when—according to these cross-sections—drought occurred in a particular area, it coincided with the collapse of an ancient society in that area. i hypothesize that drought reduced agricultural productivity in these areas, thereby leaving these societies without the resources needed to handle internal stresses and external threats. which of the following, if true, would most weaken the support for the scientist's hypothesis? a. many droughts indicated in the cross-sections of stalactites do not correspond with the collapse of a society in that area. b. information from the cross-sections of stalactites alone cannot reveal the level of agricultural output in an area at a particular time. c. most of the societies that collapsed during droughts did so when internal power struggles coincided with military raids from neighboring societies. d. most of the societies that collapsed during droughts maintained large stockpiles of food and water at the time of their collapse. e. information from stalactites also suggests that the collapse of some societies coincided with periods of abnormally high rainfall.

How does the use of fertilizers impact the environment?

What tests were able to determine when continental crust was formed?