<span>Mucous membranes provide a mechanical barrier at body openings. They also line the respiratory, GI, urinary, and reproductive tracts. Mucous membranes secrete mucus, a slimy substance that traps pathogens. The membranes also have hair-like cilia.</span>
Answer:
the outcome will change if you change anything
Explanation:
can you be a little more specific that would help me a lot with answering this the best way possible
I think it’s: A). Internal fertilization and most are oviparous.
What kind of science project?? Like an experimental one???
