This biome is characterized by little to no precipitation, and the organisms that inhabit it tend to have adaptations to help them survive long periods of drought.
What is a desert?
Mistletoe is a vine that will attach to trees and slowly suck out the water and minerals from its host. What kind of relationship do mistletoe and trees have?
What is parasitism?
These terms are for when members of a population enter or leave an ecosystem.
What is immigration and emigration?

What trophic level has the least amount of energy available to it?
What is a tertiary consumer?
100
100
This biome is the most biodiverse on Earth and stays warm year-round, it also receives lots of precipitation.
What is a tropical rainforest?
Certain species of birds are known to follow groups of army ants. As other insects leave their hiding places to flee the path of the ants, they are eaten by the bird. The relationship between the ant and the bird is what kind?
What is commensalism?
This is the term for the number of organisms in a population that an ecosystem can support- growth will occur until this line is reached.
What is carrying capacity?
A contaminant is introduced into the soil of an ecosystem. According to the principal of biomagnification, which of the following organisms is going to be most affected by it?
Grass-->Rabbit-->Fox-->Hawk
200
200
This biome is characterized by sparse trees and broad stretches of flat grassland. Conditions are hot and dry and it is also known as a "tropical grassland".
What is a savannah?
Hermit crabs are dependent on the shell of snails for a habitat and will take over unoccupied snail shells. What is the relationship between the hermit crab and the snail?
What is commensalism?

What kind of population growth is this?
Exponential growth.
What kind of relationship do these two species likely have?
Predator-prey.
300
300
This biome is characterized by extremely harsh conditions due to year-round cold. It is found at the northernmost parts of Earth and while there are no trees, short grasses will grow during the brief summer.
What is a tundra?
Aphids secrete honeydew from their bodies, which is collected by ants and used as a food source. Ants protect aphids from predators by moving them underground to their colony. What kind of relationship is this?
What is mutualism?
Provide two examples of density-dependent factors.
-Disease
-Competition
-Predation
400
400
This biome is characterized by a variety of temperatures during its four seasons, and supports hardwood trees and complex ecosystems. The northeastern United States is home to this biome.
What is a temperate deciduous forest?
An ecologist notices that when the population of species A increases, the population of species B decreases. When the population of species B rises, the population of species A also rises. What kind of relationship can we theorize exists between these two species?
What is a predator-prey relationship?
Provide three examples of density-independent factors.
-Weather
-Temperature
-Soil quality
-Natural disasters
Organisms living at the edge of their range of tolerance will experience this phenomenon, limiting survivability.
What is physiological stress?
500
500