Hormones are a group of chemicals released by exocrine glands

These hormones are directly secreted into bloodstream from where they reach the site.
There are 2 of them :-
1) Phagocytes
2) Macrophages.
These WBCs attach themselves to disease causing pathogens & then engulf them resulting in the destruction of the pathogens.
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Answer:
C. when an origanism changes tropic levels to look like another organism
Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character