Exam 24: Ecosystems

The dead zone that develops in the Gulf of Mexico forms because the large amounts of nitrogen from fertilizers and sewage carried by the Mississippi River

Phosphorus is the only major nutrient whose cycle is ________.

Almost all life on Earth is directly or indirectly dependent on

Nutrients that have a(n)________ cycle move relatively quickly through terrestrial and aquatic ecosystems.

Nutrients that have an atmospheric cycle

The marine ecosystem with the lowest net primary productivity is

Which of the following groups of organisms would NOT be considered consumers?

An ecosystem service provided by floodplains is to absorb excess flood waters,keeping floods from becoming more severe.

The amount of energy that organisms capture in photosynthesis,minus the amount lost as heat from respiration,is called ________.

Eventually,all biomass produced by any organism is consumed by ________.

Essential elements required by producers are called nutrients.

Cutting a forest to produce paper bags that are quickly discarded could be considered shortsighted; with the majority of its trees removed,the forest will

If there are 50 kcal of energy in the tertiary consumer trophic level,how many kcal would you expect to find in the primary consumer level?

An atom of phosphorous may remain out of the biological part of its cycle for many millions of years.