Color / firmness?
Semen is the term for the mixture of fluid and sperm
There are between 200,000 and 400,000 sperm cells in the ejaculate. That gives you some idea how small they are. You need to put some under a microscope to see them.
From the papers I am reading there may be mechanisms to insure only top quality sperm make it into the ejaculate.
Yes, pre-ejaculate, also known as pre-cum, may contain sperm. It is possible for sperm to be present in pre-ejaculate, although the likelihood is lower compared to ejaculate.
The deficiency of sperm cells is called Oligospermia. Oligospermia is the condition of having less than the normal number of spermatozoa in the semen.
First of all, spermatazoa (sperm cells) are very tiny body cells that can create a pregnancy in a woman. You are talking about 'Semen' which is a clear to whitish fluid that sperm cells swim around in. You do not produce semen or sperm cells before puberty. If you have a little clear semen coming out, then it most likely means that you are in the part of life called, "Puberty".
There are at least 6 to10 million sperm per ejaculation.
sperm
Sperm cells from a male's ejaculate and an egg cell released from a female's ovary join together during fertilization to form a zygote, which marks the beginning of conception.
Yes, it is possible to ejaculate without sperm present. This can happen in cases of a condition called azoospermia, where there is a lack of sperm in the semen.
Ejaculate
Pre-ejaculate, also known as pre-cum, may contain sperm in some men. The sperm count in pre-ejaculate is generally lower than in ejaculate, but there is still a risk of pregnancy if sperm is present. It is important to use contraception to prevent unintended pregnancy.