Ecosystems

a nonliving thing in an ecosystem

• biotic factor

• abiotic factor

• precipitation

• population

A forest fire has wiped out 100 acres of woods. What will the pioneer species be as species start to move back in?

• mature trees

• small trees and shrubs

• tall grasses and shrubs

• small grasses and mosses

A leading cause of reduced biodiversity and extinction of species is

• invasive species

• carrying capacity

• limiting factors

• endangered species

Which best explains biodiversity?

• the population of a species in an ecosystem

• the variety of species in an ecosystem

• the study of life

• the different number of biomes on Earth

Which biome has deciduous trees that lose their leaves?

• temperate forest

• grasslands

• tundra

• rainforest

Atmosphere, hydrosphere, and lithosphere are examples of

• carrying capacity

• limiting factors

• abiotic factors

• biotic factors

a living or once-living thing in an ecosystem

• biotic factor

• abiotic factor

• population

• nitrogen fixation

all the organisms of the same species that live in the same area at the same time

• population

• community

• ecosystem

• biosphere

the demand for resources, such as food, water, and shelter, in short supply in a community

• population

• symbiosis

• mutualism

• competition

all the populations living in an ecosystem at the same time

• carrying capacity

• community

• limiting factors

• biosphere