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.
<span>Particles that are too large to pass through the cell membrane enter and exit the cell by Endocytosis and Exocytosis
In short, Your Answer would be Option D
Hope this helps!</span>
The leaf is coated in a wax cuticle
Answer:
C. A baby can't survive without help, just like a virus needs a host in order to reproduce.
Explanation:
Viruses are not considered living beings because they are obligate intracellular parasites, composed primarily of nucleic acids (DNA, RNA or both, in some cases).
In other words, viruses have no metabolism of their own, so they cannot survive without infecting a host cell, in which the virus sets in and modifies its metabolism in order to produce more viruses.
It is during these processes that viruses cause disease in parasitized organisms.
