Stress can cause a virus to switch from the lysogenic cycle to the lytic cycle.
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An adaptation is a way that an animal has changed in its environment that allows the animal to survive.
<u><em>Adaptations make the species more genetically diverse</em></u>
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.
