Jimmy held the end of a metal bar over a fire while holding on to the opposite end. after a few minutes, the end he was holding began to get very hot. which of the following processes correctly describes the heat traveling from one end of the bar to the other?

The heat is transferred by the process of conduction of heat.

Explanation :

It is given that, Jimmy held the end of a metal bar over a fire while holding on to the opposite end.    

After some time, the end he was holding began to get very hot.

The process of traveling heat from one end of the bar to the other end is called conduction. It is the process of transfer of heat by the interaction of particles and motion of electrons.

stridor can't collapse a lung.

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: