The loin area, the top of the back.
The part of the cow that fajita meat comes from is the plate. Traditionally, fajita meat is made from skirt steaks which is made from the plate of the cow.
Ribs and steaks come from cows.
Hamburger is not from a designated area of the cow, it usually is the cutoffs from making the prime, select or choice cuts (such as steaks and roasts) and any left over meat from the carcass.
About 100 steaks per average cow.
Usually the muscles in the hindquarters are the best for being cut into steaks. Some of the shoulder is also made into steaks.
The main difference between NY strip and KC strip steaks is their origin. NY strip steaks come from the short loin of the cow, while KC strip steaks come from the sirloin. NY strip steaks are known for their tenderness and marbling, while KC strip steaks are slightly less tender but have a bolder flavor.
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No part. Chickens come from chickens, not cows.
Loin
The head
Angus beef does not come from any part of any cow, but comes from a BREED of cattle (or cows) called Angus.
Kangaroo steak comes from slaughtered kangaroos. If the question refers to which part of the animal kangaroo steaks come from, see the related link for a butcher's diagram of kangaroo cuts.