Biology, 16.07.2019 01:30, nicholasryanencarnac

For speciation to occur, members of a population must become reproductively isolated. a. true b. false

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TRUE
Speciation is the creation of a new species through natural selection operating differently on 2 populations, NORMALLY due to a NEW NATURAL BARRIER (e.g. a new moutnain range or river) emerging that separates the 2 populations. The environmental conditions are different within these 2 new habitats and so natural selection operates differently for the 2 populations, favouring different characteristics to aid surivial. The new natural barrier prevents the 2 populations interbreeding. As a result, new characteristics are not genetically passed on between the 2 populations. Eventually, the 2 populations will thus become so different in their characteristics (i.e. their phenotype) that they will no longer be able to successfully interbreed/ reproduce to produce fertile offspring.
The definition of a species is: Organisms with similar characteristics that can successfully interbreed/ reproduce with each other to produce fertile offspring.
After speciation, a new species is created. Thus, by the very definition of a species, members of a population must become reproductively isolated in order for speciation to occur.

answered: Guest

The answer is c. they had seedshope this

answered: Guest

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.