Answer: b
Explanation: b best fits how the transmission of hiv works
C. by observing them in their habitats
Ex: The Galapagos Islands. Darwin went their to study the flora and fauna in their natural habitat.
The answer is Osteon. Osteons<span> are several millimeters long and about 0.2 millimeter in diameter; they tend to run parallel to the long axis of a bone. The </span>osteon<span>units of bone are made up of Haversian canals (HC) and Volkmann canals (VC), which run perpendicular to the long axes of </span>osteons<span> and connect adjacent Haversian canals.</span>
Answer:
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