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Select all of the statements that describe the trophic levels of an ecosystem.

The selection of sites for sampling must be predetermined and all scientists must sample the same sites. 

The number of individuals that occur in a unit of area is called the population

A mutation is a source of new, novel alleles in a population.

Mutations happen during normal DNA replication or through unrepaired damage to DNA from physical or chemical causes.

The interaction between two organisms that attempt to use the same limited resource is called 

Label the phase of Mitosis. 

The biotic factors of an ecosystem are arranged in feeding levels based on what they utilize for food or energy. Each of these feeding levels is called a niche level.

Mitosis results in the formation of two genetically identical cells. 

Natural selection in bacteria occurs when a genetic mutation provides a reproductive advantage to some members of a population over other members that do not have the mutation.