Determining Population Size
Survival of the fittest
Interactions
Food Chains
Food Webs
100
Counting the number of crabs in a tide pool
What is sampling?
100
A characteristic that makes an individual better suited to its environment eventually become common in that species through a process.
What is natural selection?
100
A relationship in which both organisms benefit
What is mutualism?
100
The study of the relationship between living things and their environment
What is ecology?
100
A duck's foot with a tough membrane between the toes is a natural paddle, making swimming very easy.
What is an external adaptaion?
200
One way to determine a cliff swallow population is to count their cone-shaped nests.
What is indirect observation?
200
the behaviors and physical characteristics that allow organisms to live successfully in their environments
What is adaptations?
200
A relationship in which one species benefits and the other species is neither helped nor harmed
What is commensalism?
200
The plants that transform solar energy into food
What are producers?
200
Arrows are used in a food chain to show the direction
What is energy flow?
300
A researcher releases a marked turtle as part of a research study
What is mark and recapture?
300
The role of an organism in a habitat
What is a niche?
300
This involves an organism living on or inside another organism and harming it.
What is parasitism?
300
The organisms get food by eating other organisms
What are consumers?
300
Many overlapping food chains
What is a food web?
400
To estimate the birch tree population in the forest, count the birches in a small area. Then multiply to find the number in the larger area.
What is sampling?
400
The struggle between organisms to survive as they attempt to use the same limited resource.
What is competition?
400
Three yellow-billed oxpeckers get a cruise and snack aboard a hippopotamus.The oxpeckers eat ticks living on the hippo's skin
What is mutualism?
400
Bacteria and fungi break down the remains of organisms and return it to the soil.
What are decomposers?
400
These types of organisms are at the end of a food web
What is a decomposer?
500
If 400 rabbits die in a year in the population, and 455 rabbits are born.
What is an increase in population size?
500
Without adequate food, the predator populations starts to....
What is decline, or decrease?
500
A close relationship between two species that benefits at least one of the species.
What is symbiosis?
500
Energy enters an ecosystem when producers use this process to transform solar energy into food.
What is photosynthesis?
500
The sun
Where a food web gets its energy?
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