A large, flowing body of water that usually empties into a sea or ocean.
Trees that shed their leaves and grow new ones each year.
The slow development or replacement of an ecological community by another ecological community over time
An ecosystem that is formed where freshwater from a river or stream that merges with the saltwater from the ocean
Succession that occurs on surfaces where no soil exists
A term that describes a living or once‐living organism in an ecosystem.
The first species to populate an area during succession
Extremely cold and dry.
A term that describes a nonliving factor in an ecosystem.
The species that move into an area at later stages of ecological succession
The number and variety of different species in a given area
Trees that produce their seeds in cones and have leaves shaped like needles.
The overall weather in an area over a long period of time
A group of ecosystems with similar climates and organisms.
Frozen soil found in the tundra.
A smaller body of fresh water surrounded by land.
Aquatic system of interactions between organisms in salt water (seas, oceans; cover up to 75% of Earth's surface)
Forests in which large amounts of rain fall year round.
A large body of fresh water surrounded by land.
The ocean shore between the lowest low tide and the highest high tide
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