I think the answer is A
Hope this helps have a good night!
Abiotic factors are factors that are not caused by the activities of living organism
examples rain, wind, temperature and sunlight
If reproduction didn't exist, all species would eventually go extinct.
<span>vestigial structures because they are hard </span>
Answer:
Small external openings of lungs help in two ways:
1. It helps in trapping the dust and pathogens like bacteria, fungal spores et cetera. Larger opening would provide dust and pathogen a wider area to enter into the body.
2. The smaller opening prevents the drying of the respiratory membrane. A moist membrane is essential for the successful exchange of oxygen and carbon dioxide in the lungs.
