Answer:
<em>The correct option is B) DNA fragments are negatively charged.</em>
Explanation:
The backbone of the DNA is made up of sugar and phosphates. The phosphates present in the backbone of the DNA are the main reason for the DNA to be negatively charged. The negative charge of the DNA allows different DNA fragments to separate by gel electrophoresis depending on their charge/mass ratio. The smaller DNA fragments will move faster towards the positive end of the gel as compared to the larger fragments and hence they will separate.
Answer:
The correct answer is option c.
Explanation:
The human eye is a complex adaptation, which has evolved over many millions of years, and similarly to other composite adaptations, it still exhibits the signs of the evolutionary history. The complex adaptation of the human eye is the outcome of the evolution of the past organisms, which have utilized transitional forms of the eye. The evolution of the eye is a cumulative procedure. The evolution of the eye did not take place by random chance, however, it occurs due to billions of years of natural selection.
Convention is the answer. The circulate for warmth and cold
Answer:
Abrasion
Explanation:
Mechanical weathering is generally called physical weathering where rocks are broken down physically. It means that the rocks are broken down into smaller pieces but the rocks' composition (chemically) is not changed.
There are different ways that rocks can be broken into smaller pieces physically and gravity helps can also cause it.
Abrasion is an example of mechanical weathering where rocks bump into each other and cause the rocks to breakdown because of the force of bumping into each other. Gravity plays a role when it comes to rocks on the mountain side.
When a rock on top tumbles down the side of the mountain, it bumps into other rocks along the way. Gravity is at play here because it pulls the rock downwards, causing it to tumble.
