Population Ecology
What is population size?
The number of individuals in a population
What is predation?
An organism hunting and feeding on another organism
What is competition?
Organisms fighting for the same resources
What is parasitism?
One species benefits while the other is harmed
What is the niche of an organism in an ecosystem?
The specific role it plays in its environment
What is population density?
The number of individuals per unit area
What is extinction?
When an entire species no longer exists
What is a biotic factor in an ecosystem?
Anything living that exists in an ecosystem
What is the biomass of an ecosystem?
The total mass of living organisms in an area
Herbivores are animals that:
Eat only plants
What is immigration?
When a person or group of people move into a new place
What is natural selection?
Survival of the fittest
Which of the following is an abiotic factor in an ecosystem?
Anything nonliving in an ecosystem
What is an invasive species?
a organism that can cause harm to the environment
Carnivores obtain energy by:
Consuming other animals
What is emmigration?
When a person or group of people move away or exit where they live
What is biological evolution?
A change of genes in a population over generations
What is a primary producer in an ecosystem?
An organism that creates its own energy
What is mutualism?
Both species benefit from the interaction
Omnivores are organisms that:
Eat both plants and animals
What is the formula used to calculate population growth?
(birthrate + immigration rate) – (death rate + emigration rate)
What is a mutation?
A complete change in the DNA sequence of a gene
What is a consumer in an ecosystem?
An organism that eats other organisms for energy
What is commensalism?
One species benefits, and the other is unaffected
What is artificial selection?
Humans breeding by selecting specific traits