Answer :
Final answer:
The germinal period occurs within the first 2 weeks after fertilization, while the embryonic period lasts until the eighth week after fertilization. Significant growth and major organ development take place during the embryonic period.
Explanation:
The germinal period of human development occurs during the first 2 weeks after fertilization. It involves the early cell divisions and formation of the zygote, morula, and blastocyst stages.
The embryonic period follows the germinal period and lasts until the eighth week after fertilization. During this period, significant growth and major organ development take place, including processes like gastrulation, neurulation, and organogenesis.
The embryonic period is crucial as it leads to the formation of essential body structures and involves the highest vulnerability to harmful substances, making it vital for the mother to be cautious during this phase.
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