Which scale is used to describe the magnitude of an earthquake?
o a mercalli scale
b. richter scale
oc. magnitude scale
0
od seismic scale

B. Richter scale.

Explanation:

The Richter scale is the scale used to measure the magnitude of an earthquake. The greater the earthquake, the sharper and longer the lines and the higher the peak and lower the draught. The smaller the earthquake, the more smooth and close to a line it would be.

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The Richter scale is used to describe the magnitude of an earthquake.

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:

i believe the answer would be b. hope it : )