Everything basically has bacteria so if you touch someone that’s sick and they sneezed on their hand if you handshake that person or touch their hand the germs are on your hand now of course you can wash ur hands but there’s still bacteria on your hand it’s confirmed that everyone atleast touches their body 16 times and hour so that’s how it spreads to our body
The answer that you are looking for is A. Nephrons
On which one? There’s questions here
