Since infrared light is not visible, colors were artificially assigned to the photo using the following scheme: Photographed
Color
Wavelength
blue
1.05 um
green
1.25 pm
red
1.60 um
If all the galaxies shown were composed of the same kinds of stars and nebulae, then the reddest galaxies would
A. be youngest.
B.
be moving away fastest.
C.
contain the most hydrogen.
D
be moving toward us the fastest.

it's c. elements are placed in rows based on how may valencies electrons have.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.

um i think it might be a car?

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.