<h2>
Nuclear energy:</h2>
The energy which is harvested due to the nuclear fusion or fission occurring in a reactor is called nuclear energy. Though this energy has much application it has certain disadvantages.
<h2>Disadvantages of nuclear energy:</h2>
- The radioactive waste originating from atomic power plants and the reactors used act an extraordinary danger to Mother Nature and people.
- Improper disposal of radioactive waste released from the reactors, act as base of many deathly diseases.
- Another major disadvantage of utilizing nuclear energy is that it needs a ton of venture to set up an atomic power station. Developing an atomic power plant requires enormous capital cost.
- When the waste of this energy production process is lead to river body it causes eutrophication which causes the death of the aquatic life.
Answer:
While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million to 7 million people to a high of 18 million.
Explanation:
The correct answer is: Individuals that produce chemical compounds are better protected from herbivores and are able to produce more young than individuals that do not produce the compounds.
Natural selection acts on variations-differences in phenotype that exist among individuals. If a certain trait contribute more to survival and reproduction (individuals with that variant survive more than individuals with other variant), natural selection will favor that trait. In this case, production of chemical compounds is favored over non-producing trait.
It is called speciation.
So it'll be D. Speciation
Hope this helped :)
