Due to decreased light penetration, which area of rivers and streams will have less diversity of plant life?a.the sourceb.the mouthc.the middle portiond.none of the above
Which of the following is not a way that nonnative organisms are introduced to new aquatic ecosystems related to commerce?a.cargo ship hullsb.recreational boatsc.escape from aquariumsd.migration
The salinity in salt marshes can vary throughout the day because _______. a.river flow changes throughout the dayb.the amount of salt water in a marsh depends upon ocean tidesc.daily winds and rains result in salt and fresh water mixingd.salt water collects in the lowest elevations
Which of the following best defines sustainable fishing practices?a.Harvesting practices that maximize yields and profits.b.Harvesting practices that maximize the yield per fisherman.c.Harvesting practices that do not reduce the potential for future harvests.d.Harvesting practices that reduce the potential for future harvests.
Riparian zones can reduce the impact of water pollution.
Invasive species often unbalance the ecosystems into which they are introduced because _______.a.they did not co-evolve with the natural species and lack natural controls, like predatorsb.they breed quickly and have the potential to overpopulate an areac.they consume local resourcesd.none of the above
Which of the following is not a true statement regarding lakes? a. Lakes are fed by rivers. b. Lakes have waves. c. Lakes are found in mountainous regions. d. Lakes are smaller and more shallow than ponds. Please select the best answer from the choices provided
A strategy to reduce, reuse, and recycle would improve ocean health by _______.a.removing marine debris from the oceansb.reducing the amount of garbage available to enter the oceanc.removing garbage from landfillsd.increasing the rate of plankton growth
Fish that feed on sediment will most likely be found in _______ rivers.a.shallowb.narrowc.deepd.fast-moving
What characteristic is important for plants found in saltwater wetlands?a.tolerance to high temperaturesb.tolerance to salinityc.a range of climate zonesd.all of the above
Which of the following factors is least influential in affecting the biodiversity of wetlands?a.type of wetlandb.food abundancec.high levels of nutrientsd.water abundance
The principle difference between where salt marshes and mangrove forests grow is _______.a.the salinity of the waterb.the amount of sunlight the plants receivec.the intensity of the waves along the coastd.the extent of human development in the area
Mangrove forests were traditionally viewed as _______.a.unproductive wastelandsb.valuable fish habitatsc.an erosion preventing habitatd.pollution filters
Which of the following is not a characteristic of rivers and streams?a.vary in sizeb.mainly saltwaterc.part of the water cycled.flow toward other bodies of water
Location plays a role in wetland type, but is not the sole determining factor.
It is best to say that marine debris _______.a.is a hazard to marine animalsb.degrading ocean healthc.a pervasive, global pollution problemd.all of the above
Which of the following is a way that humans impact rivers and streams?a.pollutionb.damsc.floodingd.all of the above
The effects of agriculture and industry can be more harmful with the further loss of wetlands.
Which of the following is not an example of mechanical control of nonnative species?a.pullingb.inspectionsc.net barriersd.mowing
An increase in the number of phytoplankton in an aquatic ecosystem is always beneficial.
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