None of these
Continent where it lives
Locations where it shelters
Plant species it eats
Temperatures it experiences
Biotic factors probably play a large role in dandelion reproduction
Dandelions are not affected by soil temperature
It is hard to measure soil temperature accurately
Soil temperatures varies too much
It varies with day length
It varies with ecosystem
4 steps long
3 steps long
Animals eat plants containing nitrogen and return it to the soil through urination
Bacteria take nitrogen from the air and convert it to a form usable by plants
Organisms die and are decomposed into ammonia in the soil
Plants take nitrogen from the air and store it in their roots
Cycling of nutrients
Zones of tolerance
The size of the aquarium was a limiting factor
Food was a limiting factor
As long as Ling keeps adding more food, the guppy population will continue to grow
Guppies reproduce rapidly
One that requires plenty of oxygen
Plants that require light
Amphibians that need a warm habitat
Decomposers that feed on dead organisms
An unusual war spring resulted in a delayed overturn of the lake so nutrients in the water are limited
Native carp in the lake are stirring up the bottom with their feeding activities, making the water cloudy
Fertilizer from park lawns has run off into the water, adding too many nutrients to the system
Algae are overgrowing in the water because it is warmer than usual this year
Nereis occidentalis outcompetes Neanthes succinea at salinities under 14%
Neanthes succinea reproduces most rapidly in areas at least 20 meters from the river mouth
Both Nereis occidentalis and Neanthes succinea can survive at any salinity
Nereis occidentalis is more resistant to salinity than Neanthes succinea
Autotrophic organisms like seaweed and plankton will be common, along with many larger organisms supported by these producers.
Coral reefs and high species diversity are expected, with many kinds of fish and invertebrates.
Large open-ocean fish will live there, like tuna, marlin, and sharks.
Low species diversity is predicted, except around hydrothermal vents where bacteria, fish, and crabs live.
Although the two factors coincide, they are not likely to be related.
Deforestation on land results in lower oxygen levels in the atmosphere, which stresses the reef.
Deforestation on land allows erosion to wash away topsoil, which smothers reefs.
Burning of the rain forest increases atmospheric carbon dioxide to levels toxic to reefs.
Primary succession is the sequence of species that become established early in a newly colonized area, and secondary succession is the sequence of species that move in later.
Primary succession is the establishment of a community in an area with no soil, while secondary succession is the establishment of a new community in an existing ecosystem that was disturbed.
Primary succession is the establishment of a new community in an existing ecosystem that was disturbed, while secondary succession is the establishment of a community in an area with no soil.
Primary succession is the sequence of plants that colonize a new area, while secondary succession is the sequence of animals that move in later.
Several seasons passed during which rainfall was ample, winters were not severe and food for snow hares was in good supply.
A hurricane severely disrupted a salt marsh and uprooted most of the marsh grass in an estuary.
Forest firs on the north side of a mountain forced the white-tailed deer from the north side to move into the range of the white-tailed deer on the south side of the mountain, making food more scarce.
After a heavy rain, pesticides that were applied to a cotton crop to control weevils ran off into a waterway that flows next to a field.
Population size of predators increases when their prey is scarce.
Competition for resources is density-independent when food is plentiful.
Disease is density-dependent because transmission occurs more easily when a population is large.
A change in average temperature is a density-dependent factor because fewer organisms can acclimate to variations in temperature.