Biology

Biology, 04.08.2019 03:00, sihamabdalla591

The film defines species as populations whose members don't interbreed. what keeps different galápagos finch species from mating?

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Biology, 25.07.2019 19:30, trixxytang

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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Biology, 18.09.2019 06:30, kayabwaller4589

When brought together in a zoo, two species are capable of mating and producing fertile offspring. why may they still be considered two distinct species? wild populations of the two species have different geographic distributions. in the wild, members of one species prey upon members of the other species. zoos are artificial environments. the species are normally found in different habitats. the two species look very different?

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Biology, 17.10.2019 20:50, 341404143

"the first species of finch to inhabit the galapagos islands thousands of years ago was most likely an insect eater. today, finch species on these islands feed on a great variety of plants and animals. one early event that probably occurred that led to this feeding diversity was that (1)members of the ancestral finch species had to decide if they would be better off feeding on seeds rather than on relatively scarce insect species (2)some of the finch ancestors were born with beaks that were different from the beaks of other finches, and could eat both insects and seeds (3)some members of the ancestral species that fed on insects began to die off, leaving few offspring (4)another species of bird, a seed eater, arrived on the islands and began to breed with members of the ancestral species"

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Biology, 08.11.2019 21:31, ntangpricha

Biologists have several different ways to define species.a. according to the biological 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 reproductive isolation, which prevents gene flow between species. but in some cases, distinct species can occasionally interbreed, producing hybrid offspring.b. alternatively, the morphological species concept identifies species based on physical traits or body form. this species concept can be applied to asexual and extinct species, and it is the way most of the 1.8 million named species have been identified.c. in the ecological species concept, species are defined by their niche--the role they play in the environment.d. the phylogenetic 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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