Which of these statements is true about sperm and egg cells?

a sperm cell and an egg cell combine to form a sex cell.

sperm are continuously produced by males, while a female is born with a full supply of eggs.

both sperm and eggs can swim using flagellum.

eggs use flagellum to move towards the sperm, which are stationary.

True statement. Sperm are continuously produced by males, while a female is born with a full supply of eggs.

Characteristics of egg cells and sperm cells.
*Egg cells are usually formed in a female before birth while sperm cells form during puberty.
*Egg cells are produced in the ovary of a female human being while sperm cells are produced in the testicles of a male human being.
*Egg cells are included in the largest cells in a female body while sperm cells are the smallest cells in the male body.
*Only a single egg cell is produced during ones menstruation cycle while millions of sperm cells are released during a single ejaculation.
*Egg cells formed before birth and are active only until female menopause while sperm cells production started during puberty until death of the male body.

C14 dating since carbon is present in both living and no living objects .