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.
Answer:
to transform sound waves into mechanical vibrations
Explanation:
it's function is
D) Vaccines work to fight the disease
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B- Reproducing more often. If the environment is not right for them then reproduction doesn’t help them adapt. They respond by changing behavior, moving to another area, and even modifying their physical bodies (diets included).
Stomata is present at epidermis of the leaves lenticels are present at bark
