Answer:
Started in China it spread through people that went to visit other places or items that were manufactured there were contaminated
write it in your own words:
"In humans, five days after the fertilization, the blastocyst performs zona hatching; the zona pellucida degenerates and decomposes, to be replaced by the underlying layer of trophoblastic cells. The zona pellucida is essential for oocyte growth and fertilization."
The zona pellucida supports communication between oocytes and follicle cells during oogenesis; protects oocytes, eggs, and embryos during development, and regulates interactions between ovulated eggs and free-swimming sperm during and following fertilization.
Answer:
Igneous rocks and Metamorphic rocks determine the age of the earth.
Answer:
These cells must be able to regenerate various types of cells throughout life.
Explanation:
