Lice are known to require what to survive?

Lice are parasitic insects that rely on human blood to survive. They feed exclusively on blood from the scalp and skin, making human hosts essential for their nourishment and lifecycle. Without access to blood, lice cannot sustain themselves, grow, or reproduce, as they have evolved to thrive in this specific environment. Understanding the biology of lice highlights their dependency on their hosts and the importance of effective control measures in managing infestations.

The other options do not accurately reflect the biological needs of lice. They do not require plant nutrients or moisture in the air to survive, nor do they rely on animal prey, as their survival is specifically tied to feeding on the blood of humans. Thus, recognizing that lice need human blood clarifies their role as a parasite and informs effective approaches to treating and preventing infestations.