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The aveoli opens and closes to allow the oxygen in but keep out food liquids any thing that's not a gas bacicaly
The plastic and its usage has its supporters and critics, with both making good points, as the plastic is a material that both has its big advantages, but also its big disadvantages.
The main advantages of the plastic is that it is very cheap, the products with it are very easy for production, and it can be recycled numerous times. Also, it is very easy and practical for usage.
The main disadvantages are that the plastic needs lot of time to dissolve, depending on the type of plastic it can be anywhere from few hundred to few thousands years. Also, when it disposes it releases a lot toxic chemicals into the soil, and those chemicals are very harmful for the living organisms.
Big problem is also that most of the plastic is not being recycled, but it is thrown away, so there's enormous plastic waste everywhere in the world. Big portion of it is burned, and by burning it lot of toxic chemicals are released into the air, and that causes lot of pollution.
Explanation:
The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. If your body didn't do it simultaneously, then blood would overflow your lungs.
Answer: Seedless vascular plants can grow taller because they have tissues that support the plant and carry water and nutrients.
Explanation:
Seedless plants are those which lack seed production they have vascular system comprising of xylem and phloem tissues. These tissues help in conduction of water and nutrients from the soil this helps in growth of plants to larger sizes are compared to nonvascular plants that obtain water and minerals via diffusion with the moist soil so their growth is restricted as they do not have well developed vascular system. The example of seedless vascular plants are the ferns. The example of nonvascular plants are mosses.