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What is a biome?
a large area with a specific climate and certain types of plant and animal communities
nitrogen
a nutrient or element found in proteins and dna
oxygen
a nutrient or element that help cells carry out their special function
nonliving thing
abiotic
Define niche.
an organism's role in its habitat including its physical home, the environmental factors it needs to survive, and all its interactions with other species in the same ecosystem
Most nitrogen is converted to a usable form by ___.
bacteria
Bottom-dwelling organisms in water are called ___.
benthos
a measure of the amount of organic matter that is produced in a given amount of time
biological productivity
living thing
biotic
A bird building a nest in a tree is an example of ___.
commensalism
The relationship where one species benefits from another species and that species is neither harmed nor helped is called ___.
commensalism
all the populations of all the different species living together in the same place, in the same ecosystem, interacting with one another
community?
The relationship that exists when different species attempt to use the same limited resource is called ___.
competition
The ___ is the most diverse and productive aquatic ecosystem.
coral reef
Organisms that feed on dead and decaying matter are called ___.
decomposers
_____ is dead organic matter.
detritus
Oxygen enters water from the atmosphere by ___.
diffusion
all the living things interacting with one another and all the nonliving things in a particular place
ecosystem?
The measure of disorder in a system is ____.
entropy
an area where rivers meet the ocean or fresh water mixes in with salt water
estuary
_____ portray the First Law of Thermodynamics, as organisms eat other organisms for energy.
food chains
the place that an organism lives
habitat
Energy in ecosystems moves towards entropy as energy is converted to _____.
heat
The ___ zone is the most productive zone in lakes.
littoral
A close relationship in which two different species provide a benefit to each other is called ___.
mutualism
The free-swimming organisms in water are called ___.
nekton
Legume plants are important in fixing _____.
nitrogen
individual living thing
organism
The relationship that exists when an organism lives in or on another organism and feeds off that organism is called ___.
parasitism
Weathering is an important process in the ___ cycle.
phosphorous
___________ does not cycle through the atmosphere.
phosphorous
On land, oxygen reenters the atmosphere from the biosphere through ___.
photosynthesis
Lichens and moss are important ___ species.
pioneer
Grass is a ___.
pioneer species
Microorganisms that float near the surface of the water are called ___.
plankton
all the members of one species living together in the same place at the same time
population
The gray wolf eats elk and deer. This is an example of ___.
predation
The relationship that exists when one organism eats another organism is called ___.
predation
a group of organisms that are closely related and are able to mate and produce fertile offspring
species
Define keystone species
species in an ecosystem that are so vital to the other species that their removal causes drastic changes in an ecosystem
The relationship when two organisms live in close association with each other is called ___.
symbiosis
The ___ biome is characterized by very hot temperatures and high quantities of precipitation.
temperate rain forest
Define biomass.
the total weight or mass of a living organism
