It's rare, but possible.
No!
There are animals with multiple heads, a condition called congenital cephalic disorder.
Yes. Some alien races have multiple heads. But currently, it is unknown.
It is sperm that has 2 heads instead of 1 but, don't worry its very common!:)
There is a specialized lysosome. It is called acrosome
Because most of the sperm deformed. Two heads, two tails, huge heads, pinheads, coiled tails - the list of common deformities is a long one.
they have long tails for swimming and heads to get into the ovum
they have long tails for swimming and heads to get into the ovum
No, the name comes from the substance found in their heads, spermaceti
No problem.
No, typically only one sperm can fertilize an egg at a time.
one