Food Web
What shows all organisms in an ecosystem and how they acquire energy?
Food Web
What process changes populations over time due to changes in the environment?
Natural Selection
What are chemicals that exist in the ecosystem and are necessary for living things to function properly?
Nutrients
An Ecosystem
What is a species that naturally exists in an ecosystem?
Native Species
What relationships are most commonly depicted on a food web?
Predator Prey
What part of the food web changes when a population in the food web changes?
The entire food web responds in some way
How does carbon enter the food web?
Photosynthesis
What is an type of ecosystem that has a specific climate, nutrient level, and set of organisms?
A Biome
What is a species that is introduced to an ecosystem that it is not naturally found in?
Invasive Species
If a resources population decreases, what happens to its consumer population?
It also decreases
What process changes populations over time due to selective breeding by human direction?
Artificial Selection
How does carbon leave the food web?
Cellular Respiration
Why is water part of the ecosystem?
Because it interacts with organisms
How do invasive species affect the native species?
They compete for resources with the native species
If a consumer population decreases, what happens to its resource population?
It increases
If a population of bears lives in a cold environment that begins warming over time, what is a change in the bear population that could be expected to take place over time?
They develop thinner fur or lose blubber layers
How does carbon change as it flows through the carbon cycle?
It changes form but not mass
Why is the sun not part of the ecosystem?
Because the sun can affect organisms but organisms cannot affect the sun
How do humans usually effect ecosystems they develop for human use?
They remove habitats and reduce the amount of resources available
If two consumer populations both eat the same resource population, what is the relationship between the consumers known as?
Competition
If a population of deer have developed very long necks after several generations, what might have happened in their environment?
Their food source became taller
Name at least 3 other nutrients besides carbon that are common in ecosystems?
Water, oxygen, nitrogen, potassium, iron, etc.
What is a biome with thin tree cover, a cold average temperature, dry climate, poor soil nutrients, and large cold-adapted herbivores?
Taiga (Boreal Forest)
Deer and Elk eat sagebrush. 20 years ago cheatgrass was introduced to the ecosystem as an invasive species. Elk can eat cheatgrass, but deer cannot. How would the introduction of cheatgrass change this ecosystem.
Cheatgrass is likely to compete with sagebrush and cause a decrease in the sagebrush population. This will likely cause the deer to decrease as well.