Gently tapping the chest with the fingers to determine the position, size, or consistency of the underlying structures is called: question 83 options:

Percussion

Explanation:

Percussion is one of the five methods (Palpation, Inquiry,auscultation, inspection & percussion)  of clinical examination which is used to determine the structures underlying any surface by tapping on it slowly with fingers, any light & small instruments, hands etc.

It is commonly used for assessing the condition of thorax and abdomen. By using this method a physician is able to drive information regarding the size , border, consistency, fluid presence etc. of underlying structure.

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: