Examlex
Which structure passes oxygen and nutrients from the mother to a developing embryo
Fertilisation
The fusion of gametes (egg and sperm) to initiate the development of a new individual organism.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, representing the earliest stage of embryonic development.
Egg
A reproductive cell produced by female organisms, capable of developing into a new individual upon fertilization.
Phenotype
The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.
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