Why does an energy pyramid narrow toward the top?

only about 10 percent of energy passes to each higher level

Which two processes cycle carbon between the atmosphere and living things?

photosynthesis and cellular respiration

convert atmospheric nitrogen gas into compounds plants can use

many species and food-web links mean losing one species is less likely to collapse the system

pioneer species such as lichens and mosses

decomposers use up the oxygen breaking down the dead algae

12questions. Pick an answer and you'll see why right away.

About what percentage of energy at one trophic level is passed to the next level?
Why does an energy pyramid narrow toward the top?
Which two processes cycle carbon between the atmosphere and living things?
What do nitrogen-fixing bacteria do?
A population grows fast, then levels off at the maximum the environment can support. This maximum is the:
Which is a density-dependent limiting factor?
Why is an ecosystem with high biodiversity generally more stable?
A forest burns but the soil remains, and the community regrows. This is:
Which organisms are the first to colonize during primary succession?
A relationship in which both species benefit is called:
A non-native species spreads rapidly and outcompetes native species. It is an:
Excess fertilizer runs into a river, algae bloom, and fish die. Why do the fish die?