Answer: Valves in the veins
Explanation: The flow of the blood inside the body takes place through the veins and arteries. The oxygenated blood from the heart is supplied to the different parts of the body.
The blood flows from the capillaries to the venules and from there to the veins. The blood moves in the veins by the rhythmic movement of the smooth muscles in the body.
Most of the blood moves against the gravity so there is a chance that it can backflow so to prevent this there are valves in the veins known as one way valves.
<h3>Why are antibiotics unhelpful for treating the common cold?</h3>
Antibiotics unhelpful for treating the common cold because they only fight bacteria, not viruses. However, a cold can sometimes result in a bacterial infection. In that case, antibiotics would be beneficial if they could prevent that type of infection.
<h3>ANTIBIOTICS</h3>
- Antibiotics are medications that aid in the prevention of bacterial infections. They accomplish this by either killing the bacteria or preventing them from replicating or reproducing themselves.
- Antibiotics are drugs that kill germs in your body. However, most people use the term when referring to antibiotics.
In danger, they cannot fly for a longer time unlike the other birds. Their long,heavy tails make it a bit difficult. However their flight lasts for some seconds .
1A are highly reactive elements as they have only electron in their outermost shells .