The act of laying the egg is natures way of ensuring that IF the hen is mated she can produce chicks. In the wild a hen may not have a rooster available at all times but will be capable of reproduction on the chance meeting of a rooster.
after a couple of week it hatches
that's funny cause if u don't know rooster don't lay eggs."ha ha".
Temperature regulator
Do you mean, can a rooster lay an egg? The answer is no. Only hens can lay an egg. Do you mean, will a rooster incubate an egg till it hatches? The answer is no, only hens incubate the eggs. Occasionally a rooster that doesn't know any better will sleep in the nestbox but he is not there to incubate and could actually break and eat the egg instead. Do you mean, will a rooster chick hatch out of an egg? Yes, both roosters and hens come from eggs.
That's the rooster sperm.
No mating. A neutered rooster (called a capon) grows slightly faster than an unaltered rooster, and caponized roosters don't fight as much.
well because of the cold the chicken or rooster likes to take the egg out so when it hatches the chicken wont be so cold
Roosters crow. It is in their nature. They can't really be trained to do otherwise.
you get eggs by just hens but in order to get a chick you need a rooster to breed with a hen. then when it lays an egg it might be fertile. It takes about 21 days until the chick actually hatches.
Defensive weapons. Roosters fight and defend by kicking, the spurs are meant just for that purpose.
Well they get on the nest and start clucking kind of softly. They stick up the tail feathers and in about three minutes, the egg drops. If they are what is called broody they will saty pn the egg, for 21 days approx. till it hatches if it has been mated with a rooster. Chickens do no need a rooster to lay eggs.
A rooster's comb is mainly used for regulation of body heat.