Examlex
Although unusually resistant to many control factors,the tubercle bacillus is easily killed by
Embryonic Period
The period from 2 to 8 weeks after fertilization, during which the major organs and structures of the organism develop.
Zygote
Cell resulting from the uniting of the ovum and sperm.
Umbilical Cord
The flexible cordlike structure connecting a fetus to the placenta, delivering nutrients and oxygen and removing waste.
Psychological Closeness
The perception of being emotionally intimate or connected with another person or group.
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