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There are four main characteristics of ethos:
Trustworthiness and respect.
Similarity to the audience.
Authority.
Expertise and reputation/history.
The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction
Answer:
Explanation:
a fungus named penicillin produces a substance that kills the bacteria near it. The mold produces the antibiotic penicillin. How do fungi help plants grow? The hyphae spread underground and absorb water and nutrients from the soil for the plant.