An attempt by organisms to obtain a resource that is available in limited supply.
Each species has a different _________, or role in the community.
The study of organisms and how they interact in an ecosystem.
In an ecosystem, all the organisms of one species make up a ____________.
All the populations living in an area make up a ___________.
The living things in an area are parts of special systems called ___________.
______________ consists of the living and non-living things in an area that interact with one another
Any living thing that is a part of an ecosystem is a __________.
What root word means "living"?
Any non-living part of the ecosystem, such as water, minerals, sunlight, air, or soil,is an _______________.
A material in soil formed by the breakdown of plant and animal remains.
An environmental factor that limits how large a population can grow.
The largest number of individuals of one species that an ecosystem can support over time.
The highest rate of reproduction under ideal conditions is a population's ________________.
When a population has access to ample food, living space, and other resources, it will grow very quickly in a pattern called ________________.
A relationship between two kinds of organisms that lasts over time is called _____________.
________________ is a relationship in which an organism of one species benefits at the expense of another organism of another species (one is happy and one is sad).
When one organism benefits but does not harm the other, the relationship is called ______________ (one is happy, and the other doesn't care).
Both organisms benefit in _______________. This is a positive form of symbiosis because the relationship benefits both species.
A ___________ is a region that has a particular climate and contains certain types of plants and animals.
______________ is the average weather pattern of a region over time.
Earth's biomes include, taigas, _________, deserts, grasslands, rain forests, and deciduous forests.
___________ means "tending to fall off during a particular season."
___________ is a cool forest of cone-bearing evergreen trees.
A __________ is a small, shallow body of fresh water. Because they are shallow, sunlight can usually penetrate all the way to the bottom.
__________ are areas in which water is near the surface of the soil most of the time.
An ____________ is the part of a river where fresh water meets the sea and is affected by the tides.
About three fourths of all fish caught in the U.S. each year spent part of their lives in ____________.