AP Environmental Science Review GuideUnit 1 Test Exam Questions and Answers with Verified Solutions | Latest Updated 2026

AP Environmental Science Review Guide-
Unit 1 Test Exam Questions and Answers
with Verified Solutions | Latest Updated 2026



Ecosystem Structure abiotic, biotic factors. Levels of
organization,
organism, species, population, community,
and
ecosystem


Abiotic Factors Non-living thing
Ex: Waters, soils, minerals in the soil,O2


Biotic Fctors Living things
Ex: Grasses, elephants


Levels of organization Primary Producers, Primary Consumers,
Secondary
Consumers


Organism An individual living thing that can react to
stimuli,
reproduce, grow and maintain
homeostasis.


Species A group of living organisms of similar
individuals
capable of exchanging genes.

, Population How many of one species of an organism.
Ex:Deer(how much of a deer is an
organism in a
population)


Community Living things in an community. Groups of
different
species living together in a particular place
with a
potential for interacting with one another.
Example:Deer


Ecosystem Living and non-living things
Example: Rock, deer


Roles in an ecosystem Niches- specialist vs generalist
R vs K Selected Species, Keystone
species,
Invasive Species, Endangered species


Niches(Specialist vs Generalist) Each species occupies a niche in the
community.
A niche is the role that species play and
includes
the type of food it eats, where it lives,
where it
reproduces, and its relationships with other
species.