Answer: the four terrestrial planets must once have been hot enough to be molten (like a liquid)
Explanation: Terrestrial planets can be defined as any planet of the solar system or any exoplanet which is "Earth-like" in the sense that it is composed primarily of metals and rock, in contrast to a planet which is a gas giant.
Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars.
Scientist believing that the densest, heaviest materials are at the center and not evenly distributed can be due to the fact that they must once have been hot enough to be molten. In this case, density will take place, making the heavier under and the lighter on top.
C is true, the # of protons determine the element
1. During the Second World War Margaret Hutchinson Rousseau<span> oversaw the design of production plants for the strategically important materials of penicillin.
For the first question, the answer is B. </span><span>penicillin
2. </span>An entrepreneur is best defined as a person who <span>takes financial risk to try new business ideas. The answer is D.</span>
That could be a lot , the primary was ruled for lots of different reasons
