Which pair of organisms are scavengers?
fungi and bacteria
bears and humans
algae and plants
catfish and vultures
catfish and vultures
Which are common decomposers?
caterpillars and deer
catfish and vultures
mushrooms and bacteria
plants and algae
mushrooms and bacteria
How does energy enter most ecosystems?
producers
decomposers
water
sunlight
sunlight
Which describes producers?
They make their own food from water, oxygen, and sunlight.
They break down wastes and return raw materials to the ecosystem.
They are the source of all food in an ecosystem.
They obtain energy by feeding on other organisms.
They make their own food from water, oxygen, and sunlight.
How much energy is passed from one level of an energy pyramid to the next?
25 percent
100 percent
50 percent
10 percent
10 percent
Which is the study of where organisms live?
climate conditions
biogeography
continental drift
biogeology
biogeography
Which can limit the dispersal of species?
climate, continental drift, and physical barriers
other organisms, physical barriers, and competition
physical barriers, competition, and climate
competition, climate, and other organisms
physical barriers, competition, and climate
The very slow movement of huge blocks of Earth’s surface is _____.
a physical barrier
a dispersal
biogeography
continental drift
continental drift
Which describes the floor of a tropical rain forest?
dark, with few plants growing
bright, with small trees and flowers
wet, with tall grasses
dry, with limited animal activity
wet, with tall grasses
Which biome is located along the northwestern coast of the United States?
desert
temperate rain forest
savanna
grassland
temperate rain forest
Which describes an understory?
plants that can store water
tall grasses and scattered shrubs
huge trees like cedars and redwoods
short trees that grow well in the shade
short trees that grow well in the shade
Which describes the winters in boreal forests?
cool with some snow or other precipitation
mild with little or no precipitation
very cold with almost no precipitation
very cold with a great deal of snowfall
very cold with a great deal of snowfall
Which description applies to mountains in general?
The climate changes from the base to the summit.
They are covered with grasses and small trees like a savanna.
They are part of a single biome such as a boreal forest.
The top of a mountain is always like a deciduous forest.
The climate changes from the base to the summit.
3.
Tundra biomes have _____.
many types of deciduous trees
a variety of coniferous trees
thick grasses and tall trees
mosses, grasses, and shrubs
mosses, grasses, and shrubs
Which is an extremely cold, dry biome?
savanna
deciduous forest
boreal forest
tundra
tundra
Which describes the animals in a deciduous forest?
The mammals grow thick fur coats for the long, cold winters.
Many of the birds migrate, and other animals hibernate.
Large predators like wolves are supported by small herbivores.
Most are large herbivores that graze on the grasses.
Many of the birds migrate, and other animals hibernate.
hich describes the organisms that live in the deep zone?
prey
herbivores
scavengers
producers
scavengers
Which abiotic factors affect all aquatic ecosystems?

sunlight, temperature, oxygen, and salt content

salt content, wind, current speed, and sunlight

temperature, oxygen, salt content, and wind

oxygen, salt content, wind, and current speed