Q301: Which two organs clean waste from the blood and make urine?
Answer: The kidneys
💡 A large amount of blood passes through the kidneys every day; they filter out waste and extra water and get rid of them as urine.
23,105 questions and answers — page 16 of 1156
📕 Print the encyclopedia / PDFLearn about Science Quizzes · Secrets of the Human Body 🫀 · Math Geniuses: Beginner
Answer: The kidneys
💡 A large amount of blood passes through the kidneys every day; they filter out waste and extra water and get rid of them as urine.
Answer: False ✖
💡 An adult at rest breathes roughly 12 to 20 times a minute. Children breathe a little faster, and breathing speeds up with movement and exercise.
Answer: False ✖
💡 Even identical twins have different fingerprints. Every person has their own unique fingerprints, which is why they are used to identify people.
Answer: False ✖
💡 Blood is always red, but in the veins it is dark red because it has less oxygen. Veins only look blue when seen through the skin.
Answer: False ✖
💡 The visible part of hair and nails has no nerves, so cutting it does not hurt, but the skin they grow from is sensitive.
Answer: False ✖
💡 Bones are living tissue with cells and blood vessels. They grow as a person grows, and if a bone breaks it knits back together after being held in place.
Answer: False ✖
💡 Blood travels around the body in a continuous loop: it leaves the heart through the arteries and returns through the veins, which is why it is called the circulatory system.
Answer: False ✖
💡 Jupiter is a gas giant made mostly of hydrogen and helium, and it has no solid surface to stand on.
Answer: Because the bright sunlight outshines their faint light
💡 The stars are in the sky during the day too, but the light of the nearby Sun is much stronger and outshines them.
Answer: True ✔
💡 Earth's gravity pulls everything toward it, so rockets need very powerful engines to launch at tremendous speed and reach space.
Answer: A rocket
💡 A rocket burns its fuel and shoots upward at a tremendous speed, fast enough to reach space, while an airplane flies only within the air.
Answer: The Sun
💡 The Sun is a star like the others, but it is the closest one to us, which is why it looks big and we feel its heat.
Answer: A comet
💡 A comet is a lump of ice and dust. When it gets close to the Sun, some of its ice turns to gas, and a long, glowing tail appears.
Answer: False ✖
💡 Shooting stars (meteors) are small space rocks burning up in the atmosphere, while stars are huge suns very far away from us that do not fall.
Answer: True ✔
💡 Pictures from space show Earth as a ball, slightly flattened at the poles.
Answer: A galaxy
💡 A galaxy is a huge collection of billions of stars, and the solar system is a very small part of our galaxy.
Answer: Mars, Saturn, Neptune
💡 Mars, Saturn and Neptune are among the eight planets of the solar system, while the Moon is Earth's satellite and the Sun is a star.
Answer: Extremely hot gases, mainly hydrogen and helium
💡 The Sun is a huge ball of burning gases, mostly hydrogen and helium.
Answer: False ✖
💡 To the naked eye, Saturn looks like just a bright dot; to see its rings you need a telescope, even a small one.
Answer: Asteroid ↔ A space rock that orbits the Sun, Astronomer ↔ A scientist who studies stars and planets, Horizon ↔ The line where the sky seems to meet the Earth, Observatory ↔ A building with telescopes for watching the sky
💡 Asteroids are rocks that orbit the Sun, an astronomer is a scientist who studies objects in the sky, the horizon is where the sky seems to touch the Earth, and an observatory is a place equipped with telescopes.