Well first, your immune system has two main halves, innate and adaptive... the innate is the line of defense to fight off disease and bacteria, which is made up of anatomical barriers
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What are leukocytes?</h2>
Leukocytes are colorless cells that circulate in the blood and belongs to the body's immune system and helps the body fight infections and other diseases.
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What is their function?</h2>
Leukocytes are responsible for fighting other diseases and protecting your body from infections. Since they are part of the immune system, leukocytes circulate your blood and help cure injuries or illness.
The source of the oxygen released into the air as a product of photosynthesis is C) Water only.
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.