The rotting log and grassy area are in different biomes.

Conditions for survival are different in each location.

The rotting log has predators while the grassy area does not.

There is more space in the rotting log than in the grassy area.

the more threatened its populations are

the more similar the species will be

the more sustainable it is

the fewer varieties of species are present

The prairie ecosystem, because fewer organisms eat grass

The tundra ecosystem, because there is a variety of producers

The prairie ecosystem, because there are fewer top predators

The tundra ecosystem, because it has more herbivores

A variety of plant and animal species allows for more survivors of a natural disaster.

Having more species in an ecosystem allows the human population to increase in size.

Low biodiversity reduces the competition for resources, which helps native species survive.

Fewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystem.

Increase in biodiversity

Decrease in biodiversity

Extinction of a population from the ecosystem

Removal of many populations of organisms

The forest ecosystem is most sustainable because there are more top predators.

The grassland ecosystem is most sustainable because there are fewer organisms that eat grass.

The forest ecosystem is most sustainable because most of the animals can eat other organisms.

The grassland ecosystem is most sustainable because there is less competition for food.

Clearing land for a highway

A river floods a cornfield

A forest fire destroys the plant growth

A lava flow creates a new section of land

survive any predator

migrate during the winter

live at high altitudes

carry out photosynthesis

grasses → flowering plants → shrubs → native trees

native trees → shrubs → flowering plants → grasses

shrubs → grasses → native trees → flowering plants

flowering plants → native trees → shrubs → grasses

Ecological succession leads to equilibrium in an ecosystem.

Ecological succession prevents ecosystems from ever reachingequilibrium.

There is no relationship between ecological succession and equilibrium.

Ecological succession and equilibrium are the same thing.