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free large material available here Adaptive Advantages Of Sex, Sexual Characteristics, Sex Hormones, Human Sexuality, Human Sexual Characteristics, Female Sexual Organs, Male Sexual Organs, Sexual Development, Prenatal Sexual Development, Childhood, Puberty, Adolescence, Gonads, Transportation Of The Reproductive Cells , Genitals, Accessory Glands, Homology, Pregnancy, Complications, Labor And Childbirth
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ONLINE SEX EDUCATION
ONLINE SEX EDUCATION
Physical and behavioral difference that distinguishes individual organisms according to their functions in the reproductive process. For information on issues of sexual health, sexual behavior, and sexual activity
Sex occurs at all levels of biological organization, with the exception of viruses. At the lowest level, bacteria conjugate and a length of the single chromosome is passed from the male, or donor cell, to the female or recipient cell. At more advanced levels, multicultural individuals have specialized organs (gonads) that produce specialized sex cells (gametes). On fertilization, genetic information is transferred from the small, motile spermatozoa (male gametes) to the much larger ova (female gametes). Plenty of organisms, including most plants, plenty of protozoans and invertebrates, and some fishes, have both female and male gonads and are called hermaphroditic (see Hermaphroditism). Hermaphroditic organisms, however, are never self-fertilizing; the female and male reproductive organs ripen at different times—times that also coincide with those of other individuals, thereby ensuring cross-fertilization.
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