The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms
an animal that feeds on flesh , eats meat
is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment
are hardy species which are the first to colonize previously damaged ecosystems, beginning a chain of ecological succession that leads to a more bio diverse steady state ecosystem.
an association between two organisms in which one benefits and the other neither benefit nor harm.
a group of people living in the same place or having a particular characteristic in common
The interaction of two (or more) organisms (or species) such that, for both, the birth or growth rate is depressed and the death rate increased by the presence of the other organisms (or species).
primary consumers - herbivores that feed on producers. secondary consumers - consumers that feed on primary consumers and/or producers.
an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.
Scientific study of interactions among organisms and between organisms and their environment
An ecosystem is a community of living organisms called producers, consumers, and decomposers. Contains biotic and abiotic components that are linked together through nutrient cycles and energy flows.
the action of coming to live permanently in a foreign country
The definition of an energy pyramid is a pyramid diagram showing the earth's food chain from the ground up
a hierarchical series of organisms each dependent on the next as a source of food
a system of interlocking and interdependent food chains
the natural home or environment of an animal, plant, or other organism.
an animal that feeds on plants
a host is an organism that harbors a parasitic, or mutual, typically providing nourishment and shelter
Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other ( Pollination is an example)
is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces
Primary succession is one of two types of biological and ecological succession (cycle) of plant life, occurring in an environment in which new devoid of vegetation and other organisms usually lacking soil is deposited
an animal or person that eats food of both plant and animal origin
an organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense
is a relationship between two things in which one of them (the parasite) benefits from or lives off of the other, like fleas on your dog
all the inhabitants of a particular town, area, or country
leave one's own country in order to settle permanently in another
the preying of one animal on others , the action of attacking or plundering
an animal that naturally preys on others
an animal that is hunted and killed by another for food
An organism that serves as a source of food for other organisms in a food chain
a set of organisms adapted to a particular set of resources in the environment
the living together in more or less intimate association or close union of two dissimilar organisms