Ava and eddy are discussing the difference between a species being extinct and an endangered species. ava states that extinction means that the species is no longer alive. eddy states that extinction is when a species is close to dying out. who is correct? question options: ava is correct because extinction means that a species has died out and is no longer alive. eddy is correct because extinction means that the species is close to dying out and there are not many left. neither of them are right. extinction is a term used to describe the environment in which a species lives. both of them are right because extinction refers to a species that is either about to die out or has already died out.

In biology the term extinct is used for species which are no longer alive. so here Ava is correct because a species has died out and is not longer alive.

Endangered species are those which are on the urge of being extinct, means they are in danger so the term "endangered"

Ava can also elaborate the terms by taking examples

Dinosaurs are extinct species. They are no longer alive or not found in any part of world. So they are called as extinct.

The term can be used for animal or plant species.

the answers would be

the first one and the second one

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.