The answer is C because transportation regulation is going to prevent overcrowding and therefore help with good hygiene. this prevents the spread of germs.
do you have the signs yu could list? we need them in order to determine the answer
Answer:
10,000
Explanation:
The human nose has roughly 400 types of scent receptors that can detect at least 1 trillion different odours. The human nose can distinguish at least 1 trillion different odours, a resolution orders of magnitude beyond the previous estimate of just 10,000 scents
hope this helps
