In sperm cells<span>, four haploid </span>gametes<span> are </span>produced<span>. In egg </span>cells<span>, </span>meiosis<span> results in a single haploid</span>gamete<span>, with the remainder of the genetic material lost in the formation of three nonviable polar bodies.</span>
The correct answer is A.primary, because a primary landform is a natural feature on earth's surface.
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<h2>Koch's Postulates.</h2>
Explanation:
The next step should be isolate the microorganism from the mice and check if it is identical to the original microbe.
According to Koch's postulates, a microbe can be considered as a causative agent of a disease only after all the following are established:
- The microorganism should be present in all the organism suffering from the disease.
- The isolated microorganism should be grown in pure culture.
- The organism grown in the culture should be reintroduced in the susceptible but healthy host.
- Finally the microorganism must be re-isolated from the experimental host an cultured to see whether it is identical to the original specific microorganism.