Answer:
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Explanation:
Answer: The correct answer is : The critical density for the universe is approximately 10 ^ -26 kg / m ^ 3 or you can also say 10 hydrogen atoms per cubic meter.
Explanation: This value is given by:
critical density = 3H ^ 2/2 Pi G, where H is the Hubble constant and G is Newton's gravitational constant.
Critical density is the average density of matter necessary for the universe to stop its expansion but after an infinite time.
Answer:
Ears are the organs of hearing in animals. The primary function of ears in animals is to detect sound. Big ears of some animals like elephant, rabbit keep them cool. Ears help the animals to hear the sound of predators, so that they can escape and prevent themselves from them....
I believe its C. Cross-sectional
Answer:
Tornado Alley is a nickname given to an area in the southern plains of the central United States that consistently experiences a high frequency of tornadoes each year.
