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Artyom0805 [142]
3 years ago
5

Explain why the lower respiratory tract is essentially sterile.

Biology
1 answer:
Gemiola [76]3 years ago
7 0

Answer:

The lower respiratory tract is essentially sterile because epithelium lining is the respiratory tract that covers the bottom respiratory tract sterile. It basically prevented the mucus accumulation in lungs. The macrophages is the immune system part that can digest or inhaled any harmful substances.

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Differentiate between a spider's web and a bird's nest.​
Kruka [31]

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one is made of silk and one is made from branches and anything to keep it together and for padding

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the spider makes the webs out of silk and it traps anything that goes through it. the birds make the nests from branches and litter.

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B, is the answer. I believe.

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