If the scientist had collected 20 dung samples, would you expect more bands, fewer bands, or the same number of bands on the gel?

If the scientist collects 20 dung samples ; we should expect more band on the gel

Given that each dung sample has varying sizes and varying thickness of bands in the gel electrophoresis which depends on the size of fragments contained in it. Therefore when a number of dung samples ( 20 ) are collected  it is only logical that the number of bands on the gel will increase ( i.e. you should expect more band on the gel ).

Hence we can conclude that If the scientist collects 20 dung samples we should expect more band on the gel .

Learn more : link

Although your question lacks some data a general answer within the scope of your question is provided

The expectations of the bands will be more on the gels.

Explanation:

One sample provides several sizes and thickness bands in the gel electrophoresis according to the size of fragments that run in it. An individual would expect more bands due to the increase in the number of samples which is 20 samples now.

An increase in the number of samples produces more bands. So one can easily expect more bands from the 20 samples. Scientists would get more bands on the gels.

Thus, the expectations of the bands will be more on the gels.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.