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A tick living on a dog and drinking it's blood = Parasitism

Birds that live among cattle too eat insects stirred up by grazing =  Mutualism

A clownfish living on the tentacles of an anemone provides nutrients too the anemone, and the clownfish is protected from predators = commensalism

A bear catching and eating a salmon from the river = predation

A bobcat catching and eating a rabbit = predation

A tapeworm living on the digestion system of a horse = parasitism

A Egyptian plover eating bugs off a giraffe or rhino  = Mutualism

Bees gathering nectar and then spreading pollen too a flower = commensalism

Explanation:

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answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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.