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29 Cards in this Set

  • Front
  • Back
the process of combining nitrogen with hydrogen to form ammonia
nitrogen fixation
a pathway formed when a substance enters a living organism, stays for a time in the organism, then returns to the nonliving environment
biogeochemical cycle
A(n) ______________ consists of a community and all the physical aspects of its habitat, such as the soil, water, and weather
the rate at which organic material is produced by photosynthetic organisms
primary productivity
The living organisms in a habitat are called
biotic factors
Succession that occurs where plants have not grown before is called
primary succession
The many different species that live together in a habitat are called a(n)
_______________ is the study of the interactions of living organisms with one another and with their environment
an animal that eats plants or other primary producers
Succession that occurs where previous growth has occurred is called
secondary succession
The physical aspects of a habitat are called
abiotic factors
The place where a particular population of a species lives is called its
organisms in an ecosystem that first capture energy
an organism that obtains energy by consuming plants or other organisms
The first organisms to live in a new habitat are small, fast growing plants called
pioneer species
a level in a graphic organizer based on the organism's source of energy
trophic level
The path of energy through the trophic levels of an ecosystem
food chain
an animal that eats herbivores
an animal that is both an herbivore and a carnivore
an organism that obtains energy from organic wastes and dead bodies
bacteria and fungi that cause decay
a interconnected group of food chains
food web
The number of species living within an ecosystem is a measure of its
a diagram in which each trophic level is reresented by a block with a width proportional to the amount of energy stored in the organisms at that trophic level
energy pyramid
the dry weight of tissue and other organic matter found in a specific ecosystem
A somewhat regular progtression of species replacement is called
water retained beneath the surface of the Earth
ground water
the evaporation of water from the leaves of plants
Nagy Chapter 17 vocabulary
cut apart and study