Exam 36: Ecosystems

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

Humans intrude into the nitrogen cycle by:

Herbivores are at what trophic level within an ecosystem?

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

A _________________ in a community is made up of the organisms feeding at the same number of steps away from the Sun.

Deserts that occur on the back sides of mountain ranges are due to an effect called a __________________.

Which of the following are decomposers?

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

Devise an example of a food chain with four links.

When the energy flow through an ecosystem is measured at each trophic level,__________ of the available energy passes from one level to the next.

The Earth completes one rotation about its axis every:

Microscopic organisms floating on the surface of the ocean make up the ___________________.

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

When you eat a hamburger,you are the:

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