Exam 36: Ecosystems

Which is incorrect about deep-sea organisms?

Life exists on Earth because of the constant flow of light energy from the Sun that is transformed into chemical energy.

The loss of _____ that occurs at each trophic level places a limit on how many top-level carnivores a community can support.

The flow of energy is one way,but nutrients in ecosystems _____________.

_______ bacteria convert nitrate into atmospheric nitrogen.

In an inverted aquatic biomass pyramid,which organism is likely found at the bottom?

Which zone in a lake is the shallowest part?

Herbivores are at what trophic level within an ecosystem?

Circling the globe at northern latitudes is ____________,with coniferous trees and long,cold winters.

Humans intrude into the nitrogen cycle by:

How have humans intruded into the global water cycle?

Which part of the lake contains numerous bacteria and wormlike organisms that consume dead debris?

The British Isles experience warmer weather than other areas of the same latitude because of:

Shallow,highly productive lakes with an abundance of algae are called:

Uncontrolled growth of algae in an aquatic ecosystem is due to a process known as ________________,caused by excessive inputs of nutrients.

Why do food chains rarely have more than three or four links?

The Earth completes one rotation about its axis every:

When you eat a hamburger,you are the:

The type of ecosystem that can be found bordering the tropics worldwide that is characterized by huge herds of grazing animals is:

_______________ are found halfway between the equator and poles,cover the interiors of major continents,and have been largely converted to agricultural use.