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en.wikipedia.org/wiki/Intraspecific_competition

Intraspecific competition is an interaction in population ecology, whereby members of the same species compete for limited resources. This leads to a reduction in fitness for both individuals. ... The resource must be limited for competition to occur; if every member of the species can obtain a sufficient amount of every ...

www.columbia.edu/itc/barnard/biology/biobc1001/quizzes/BIOBC1001x_q7.html

If the frequency of expression of a recessive trait in a population is 16 percent, the frequency of the ... Two individuals are members of the same species if they ...

slideplayer.com/slide/9746334

The next year, the farmer used the same herbicide on his field. This time the ... 29 Two individuals are unquestionably members of the same species if they:

www.boundless.com/biology/textbooks/boundless-biology-textbook/evolution-and-the-origin-of-species-18/formation-of-new-species-125/the-biological-species-concept-500-11726

A species is defined as a group of individuals that, in nature, are able to mate and ... Members of the same species are similar both in their external appearance and ... the closer the relationship between two organisms, the more similar they will ... Mutations can occur in any cell of the body, but if a change does not occur in a ...

www.burwur.net/sinns/3species.htm

If A and B are two individuals and they can mate to produce fertile progeny, they ... Two individuals are members of the same species if they differ by fewer than ...

www.quora.com/Can-two-members-of-the-same-species-reproduce-a-member-of-another-species-If-not-is-it-impossible

Yes! A number of species are the result of a hybridization between two other species. ... If conditions aren' changing, they may mostly vary around a central theme, like sharks over the last few million years or Detroit's cyclical "new car year.

www.biology4kids.com/files/studies_species.html

Species=Individuals. Scientists have all these complex ways of organizing living things. They look at your physical traits, how you develop as a fetus, or in an egg. ... You are the same species as another being if you can do a really important ... fern is the probably the same species if the two ferns can create a similar fern that  ...

www.dummies.com/education/science/evolutionary-ideas-species-and-speciation

Individuals can mate and reproduce with members of their own species but ... The defining characteristic separating one species from another is that they ... Here's how it works: Two different populations of the same species evolve in different ways. ... If it wasn't for all the populations in the middle, the two end populations ...

www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/understanding_environment/classificationrev4.shtml

Individuals of the same species have more characteristics in common than they do with ... If they live in different type of habitat, closely related species may have  ...

biology.stackexchange.com/questions/45411/how-can-two-individuals-of-the-same-species-have-different-chromosome-numbers

How can two individuals of the same species have different chromosome numbers? ... If this question can be reworded to fit the rules in the help center, please edit the ... biological species concept, a species is a group whose members can ... they still produce fertile offspring, so they are the same species. If  ...