Who discovered that planetary orbits are ellipses rather than circles?
What will be an ideal response?
Johannes Kepler.
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When a population has unlimited resources, it grows ________. When a population grows at a fixed rate per amount of time, it grows ________
A) exponentially; logistically B) logistically; logistically C) logistically; exponentially D) exponentially; exponentially
A population of similar individuals that in nature interbreed and produce fertile offspring:a
genus b. species c. kingdom d. class e. order
Which statement about average stream velocity is true?
A)Velocity is higher in the upper reaches where gradients are steeper. B)Velocity is constant along the river's course. C)Velocity decreases downstream because the gradient is less steep. D)Velocity increases in the downstream direction. E)Velocity decreases downstream because of frictional forces.
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the iron and the sulfur are not separated from one another. What type of material is this sample?
A) a compound B) a homogeneous mixture C) a heterogeneous mixture D) There is insufficient information to answer.