The key idea is that flea eggs are not tightly attached and can be laid on the host but often fall into the surrounding environment. After a female fleas feeds, she will lay eggs that drop off into the animal’s bedding, carpets, cracks, and other debris, where they hatch and develop. At the same time, some eggs can remain on the host for a time, especially if grooming is limited or infestation is light. Therefore, both sites are valid deposition locations, making the statement that both are true the best choice. This also explains why effective flea control targets both the pet and the environment, since eggs deposited in debris continue the life cycle even if eggs on the animal are removed or killed.

House dust mites produce allergenic proteins in their bodies and feces. When these allergens are inhaled or contact the skin, they can trigger an immune response in people who are sensitive, leading allergic reactions such as sneezing, runny nose, itchy eyes, asthma symptoms, or eczema. These reactions are the health effects most commonly associated with mite exposure. Nausea, skin infections, or hair loss aren’t typical outcomes from dust mite exposure.

Plague bacteria are spread to people mainly through flea bites. Fleas become infected after biting rodents that carry the bacteria, and when an infected flea bites a person, the bacteria can be transmitted in the flea’s saliva or through regurgitated material during feeding. This is why controlling flea infestations and rodent populations is crucial for prevention. Ticks, lice, and mosquitoes transmit other diseases, but they are not the typical vectors for plague.

The characteristic feature being tested is the pattern on the beetle’s wing covers (elytra) and how that pattern helps identify stored-product pests. Straight, evenly spaced pits arranged in rows along the elytra point to a small, dull brown beetle known for infesting stored foods. Among common pests, this exact rowed, punctate elytral pattern is typical of the drugstore beetle. Carpet beetles have elytra that are patterned with scales forming mottled or spotted looks rather than orderly pits. Weevils are distinguished by their long snout and often have ridged or grooved elytra but not the neat in-row punctures described. Lady beetles are usually rounder and display bright color patterns with spots rather than a lined, pitted texture on the elytra. So the described features best match the drugstore beetle, a well-known stored-product pest.