Tasha is studying polar and tropical climates on Earth. She recorded the following in her notebook: Summer temperatures are much higher than winter temperatures in polar climates.
Summer and winter temperatures are similar in tropical climates.
Tasha wonders why the tropical climate has similar temperatures throughout the year, but the polar climate temperatures differ greatly.

Which of the following arguments best supports why temperatures in the polar climates differ more than tropical climates throughout the year?

A. The tropical regions have longer days and shorter nights than polar regions, so they receive less solar energy.

B. In their orbit around the Sun, polar regions are closer to the Sun in summer and farther away in winter.

C. The angle of the axis causes the polar regions to be tilted more, either toward or away from direct sunlight.

D. Most regions with tropical climates are located near large bodies of water that make the climate more even.

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.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

i think tornado but not 100%