Answer:
First of all, the reverse transcriptase synthesizes viral DNA from viral RNA, and then from newly made complementary DNA strand. The second replication process occurs when host cellular DNA polymerase replicates the integrated viral DNA. ... Therefore, mutation can occur during one or all of these replication steps.
Explanation:
Scientists study both the flatworm Planaria and the roundworm Caenorhabditis elegans in laboratories, using them as test subjects, and while they may seem similar, they have some distinct internal and external differences. Flatworms (phylum Platyhelminthes) and roundworms (phylum Nematoda) differ in shape, means of locomotion, how their digestive systems function, and in the ways they are harmful to human beings. While both species are called worms, they are not closely related.
The correct answer is option B
The use of fossil fuel in harvesting of apples lies at the stage when the apples fall from the tree. When there lots of apple that has to fall from the tree and picked up for sorting. Monster machines are used for the shaking of trees vigorously so that lots of apple fall at a same time. This machine use fossil fuel for its working.
Answer:
c
Explanation:
Deforestation is a particular concern in tropical rain forests because these forests are home to much of the world's biodiversity. For example, in the Amazon around 17% of the forest has been lost in the last 50 years, mostly due to forest conversion for cattle ranching.
Answer:
-Avoid large crowds
-Wash your hands regularly
-Strengthen your immune system
-Get an annual flu vaccine
-Clean and disinfect surfaces
