Winds are light at the equator because of the weak horizontal pressure gradients located there. The warm surface conditions result in locally low pressure. ... At this latitude surface high pressure causes the air near the ground to diverge.
C. Law of segregation is the Mendel's law that states that gametes carry one allele for each trait.
Well, the food is in the environment. I would like to compare it with how bacteriae feed (however my biology is quite rusty), that is, they engulf their food and they "digest" -- not the proper term, since there are no organs to do real digestion -- it.
The answer is an envelope.
A virus is an infectious agent that can replicate only inside a host cell. When it is outside the cell, it consists of genetic material coated with protein capsid. Some viruses also have an envelope which covers capsid. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
