The answer is that <span>healthy </span>legs<span> have </span>veins<span> with smooth, elastic walls that </span>are<span> perfectly designed to </span>adapt<span> to the changes in pressure within a </span>vein<span>. </span>Veins<span> have </span>valves<span> that keep blood moving in one direction: back toward the heart. As the </span>leg<span> muscles </span>are<span> activated, the </span>venous valves<span> open to </span>allow<span> one-way flow in the direction of the heart.</span>
Answer: Perform experiments to test your hypothesis.
Explanation:
Experiments and hypotheses go hand-in-hand. Hypotheses, which are proposed explanations for scientific observations,
Experiments are designed based on the measurable variables defined in a given hypothesis.
Answer:
By Doing it this way, we allow the American People to have more of a say. This keeps them happy in the US, and prevents repeats of the Revolutionary War. When the people choose their leaders, they can hope that the leaders have the people on their mind
Explanation:
Some of the inventions that revolutionized American life in the late 1800s are:
- Telephone. <span>Alexander Graham Bell invented the “electric speech machine,” or telephone, in 1876 which revolutionized the way people speak and communicate to people.
-QWERTY. </span><span>The QWERTY is the most used keyboard nowadays. It was created by Christopher L. Shole in 1874. He is the one who introduced the QWERTY keyboard to the world.
- American Football. American Football is nowadays one of the biggest sport of the United States. The invention of it was credited to Walter Camp. The first professional game of football was held in 1892.
- Skyscraper. The first skyscraper, known as the 10-story Home Insurance Company Building in Chicago was designed by architect William Le Baron Jenney. </span>
Answer:evolutionary psychology
Explanation:
Evolutionary psychology focuses o those behaviors that are due to the traits that we inherited from our ancestors, one's territory was very crucial to protect by all means and this was a survival instinct from our ancestors. If they didn't protect their territory that means they would lose everything that they have built so this issue of not wanting to reverse out if someone is coming in your previous parking spot is an instinctive way of protecting one's own territory.
