1. what caused the tree bark to become darker 2. In the lab simulation which colored pepper models able to have a higher rate of survival on the light bark
3. Lab simulation which color I have the highest rate of survival on the dark bark
4.During the end of social revolution explain what causes a population of light colored moths a decrease in the population of dark colored moths to increase overtime each sure to include how the ability to survive and reproduce and pass the process of natural selection

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.