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likoan [24]
3 years ago
11

Which statement describes many of the structures involved in the first line of defense of the immune system​

Geography
2 answers:
DochEvi [55]3 years ago
6 0

Answer: They have contact with the external environment.

(I took a test over this and got this question right)

devlian [24]3 years ago
5 0

Answer: physical and chemical barriers

Explanation:

physical and chemical barriers try to prevent pathogens from getting inside the body

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When hiking up most stratovolcanoes, which rock composition(s) will you see from its base to its summit? Quizlet
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Answer: d. Felsic from bottom to top

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Most of the known volcanoes are Stratovolcanoes. They are also called Composite volcanoes because they are structured from layers of materials such as lava, ash and tephra that came out during their eruption with each eruption adding more layers than the last.

The lava that flows from a Stratovolcano is usually made up of Felsic along with lesser amounts of silica and mafic. As a result, most of the rocks that make up such volcanoes are Felsic.

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snow_lady [41]

Around the world, the cities with the dirtiest air and water are typically found in Low-income countries in Africa and Asia.

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Reason most low income countries espcially Africa and Asia are dirty is largely due to poverty. This is the bane of under deveolpment in these regions.

Most low income countries are poor hence lack basic social amenities to take care of their environment.

Hence, around the world, the cities with the dirtiest air and water are typically found in Low-income countries in Africa and Asia.

Learn more about environements here : brainly.com/question/18827802

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