8. How do you bring a specimen into focus quickly? ​

Start by rotating the objective lens to lowest power.

Place a slide on the stage, label side up, with the coverslip centered.

On LOW POWER ONLY, use the coarse focus knob to get the object into focus.

If you cannot see anything, move the slide slightly while viewing and focusing.

If nothing appears, reduce the light and repeat step 4.

Once in focus on low power, center the object of interest by moving the slide.

Rotate the objective to the medium power and adjust the fine focus only.

If needed, rotate the objective to the high power and adjust fine focus only.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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