Question 3
hcl is the formula for
a)the hydronium ion
b)hydrochloric acid
c)hydrogen peroxide
d)sodium hydroxide

HCl is known as hydrochloric acid. Hence the answer is option B.

Explanation:

Hydrochloric acid is an example of strong acid. This can be completely dissociates into aqua solution. It is also the very common acid used in chemical reactions. It is formed by the fusion of hydrogen atom and chlorine atom. This is formed due to the single substitution of ions.

The molecule has lower value of PH which indicates it as a very strong acid. This add acid is also present in our stomach. This side also helps in proper digestion of food and preservation of the food inside the stomach and it also close all the bacteria which are harmful for the human body

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:

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: