Living Environment Translated English 2014 | Page 30

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and 120cm, and forests dominated by trees with needlelike
leaves
e. Tropical rain forest- most biodiverse biome, has an average
temperature of 250C and receives between 200-600 cm of
precipitation each year
f. Desert- the driest biome on Earth with less than 25 cm of
rain each year; has dunes or thin soil with little organic
matter, where plants and animals are adapted to survive in
extreme conditions
g. Grasslands- temperate and tropical regions with 25-75 cm
of precipitation each year, dominated by large areas of
grass ; good for growing crops and raising cattle and sheep
An ecosystem is made up of the living organisms (biotic factors)
and the nonliving parts ( abiotic factors) of an area.
Freshwater Ecosystems:
a. Temperature, light, salt, and dissolved oxygen are
important factors.
b. Rivers, streams, lakes, ponds, and wetlands are freshwater
ecosystems.
c. Human activities can pollute aquatic ( water) ecosystems.
Wetlands are areas that are covered with water most of the year.
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