Answer: C. carrying a gene or genes essential for survival
Explanation:
A plasmid can be defined as the small, extrachromosomal, double stranded DNA that can be found in the bacterial cell and in other prokaryotes. The plasmid DNA remain physically separated from the chromosomal DNA. The plasmid DNA can replicate independently.
The plasmid DNA carries genes which can facilitate the survival of the organism. This gene may provide the selective advantage like antibiotic resistance to the bacteria or any other organism. But the gene may not be essential for the survival of the organism.
A. The allele frequency of a population changes due to a bottleneck.
This is because genetic drift happens because of chances events such as founder effect of bottleneck effect
Answer:
d solute in the tubes changing
Explanation:
Answer: it is D : their motion increases
Explanation: because as heat is increased it causes the particles to gain more kinetic energy making them move faster thus increasing their motion and leading to more successful particle collision .
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Ecotones are the<u> transitional zones between two ecosystem.</u>
Explanation:
Ecotones is a narrow zone between two different ecosystem.
It may be defined as the transition zone between these two ecosystem. Ecotones are species rich and it's resources are used by inhabitants of both the ecosystem.
Ecotones are marked by sharp changes in vegetation and species population.
The ecotones arise due the drastic changes in the environmental condition of a place that creates a sharp boundary between it and adjacent area.
However, these changes blend somewhere in between these area and results in formation of ecotones.
Example of ecotones can be the mangroves. These lie between marine ecosystem and terrestrial ecosystem.
