__________ is the reason it is harder to stop a baseball flying at 100 MPH than it is to stop a baseball flying at 50 MPH.
Answer(s): B
Momentum equals mass (amount of matter in an object) times velocity (speed in a given direction).
Which of the following ecosystems could be described as housing thousands of species and has tall trees that form a ceiling from the the Sun above?
Tropical rain forests are one of the most important areas on Earth. These special ecosystems are home to thousands of species animals and plants.Rain forests are not only densely packed with plants, but are also full of tall trees that form a ceiling from the Sun above. This ceiling keeps smaller plants from growing. Areas where sunlight can reach the surface are full of interesting plants.
Via which of the following unoxygenated blood travels to the heart?
Veins carry blood devoid of oxygen to the right atrium of the heart. Arteries, capillaries, and the aorta carry oxygenated blood from the heart to blood cells throughout the body.
In vertebrates, which substance gives red blood cells their color?
Answer(s): D
Hemoglobin, used by all vertebrates and some invertebrates to transport oxygen and carbon dioxide in the body, gives red blood cells their color.
How many different elements are present in glucose, C6H12O6?
C6H12O6 contains 3 elements: carbon, hydrogen, and oxygen.
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