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Biologists have several different ways to define species. 1. according to the species concept, a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring. the separation between species is maintained by isolation, which prevents gene flow between species. but in some cases, distinct species can occasionally interbreed, producing offspring. 2. alternatively, the species concept identifies species based on physical traits or body form. this species concept can be applied to species, and it is the way most of the 1.8 million named species have been identified. 3. in the species concept, species are defined by their niche--the role they play in the environment. 4. the species concept defines species as the smallest group of individuals that share a common ancestor and form one branch on the tree of life.

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liz33312
Hi, I presume you are asking for the type of names of the different definitions for 1, 2, 3 and 4. Am I right?

1. Biological definition, the most precise of all definitions, but may not be helpful to identify species that are already extinct and enshrined in stones (I.e. fossilized)

2. Morphological definition, which focuses on the morphology of animals. The thing is, some individuals with very similar morphology may be two completely different species and are unrelated.

3. Ecological definition. A niche is how an animal interacts with its environment; for e.g., how an animal gets it's food, or how it reproduces.

4. Phylogenetic definition. Sometimes it is difficult to identify the smallest group of individuals that share a common ancestor, maybe due to a lack of fossil evidence.

Hope this helps! :)

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