What is required in order to melt a network solid

High Bond Dissociation Energy

Explanation: A network solid refers to a solid compound (chemical compound) in which the atoms within the compound are bonded to each other by the covalent bond, maintaining a network of strong bonding. Covalent bonding is the strongest of all the bonding types.

In order to break a compound made up of covalent bond, a huge amount of energy is required which is known as the bond dissociation energy. This energy required to break the bond depends upon the strength of the covalent bond between the atoms.

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.

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