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Prenatal development

Prenatal development

This animation demonstrates the development of the human embryo and foetus.



pregnancy, fertilisation, female reproductive organ, fetus, development, implantation, morula, blastocyst, germ layer, yolk sac, chorionic villi, neural tube, limb bud, womb, ontogeny, Fallopian tube, vagina, endometrium, cervix, cervical os, sperm cell, zygote, amniotic sac, umbilical cord, egg, embryo, placenta, menstruation, ovulation, smooth muscle, human, biology

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The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.


Our gametes are haploid cells produced from diploid cells by meiosis, a special type of cell division.


Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.

The ear and the mechanism of hearing

The ear converts the vibrations of air into electric signals which are then processed by the brain.

The sense organs

Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.

The reproduction and development of insects

Based on their life cycle, insects can be grouped into three categories: ametabolous, hemimetabolous or holometabolous insects.

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