Answer: Phagocytosis
Explanation:
White blood cells are the very important part of the immune system which has the ability to kill the harmful substances that reach the body.
They patrol like police inside the circulatory system and wipe out the pathogens like bacteria and virus by the process known as phagocytosis. They engulf these harmful particles and in this way it kills the cells.
hence, the correct answer is option B
Strong collagenous fibers, known as Sharpey’s fibers, connect the periosteum to the bone surface. This fiber extends to the bone’s circumferential (outer part) and interstitial lamellae (inner). It’s specifically made up of a fibrous layer (outside) and a cambium layer (inside).
Internal fertilization is when male deposits sperms directly in females body whereas internal fertilization is when male and female gametes unite outside the female body .
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