Answer: At about three thousand miles in diameter, Mercury is the smallest planet in the solar system. But its core is massive — it accounts for more than three-quarters of the little planet's diameter, and more than half its mass. ... So even though Mars is bigger than Mercury, it's less dense — a rocky planet with a difference.
Explanation:
Answer:
Fossil records provide evidence of an increase in animal species at the same time that atmospheric oxygen levels increased.
Explanation:
A huge diversification among animal species occurred with the increase in the levels of atmospheric oxygen. The reason why the number of species increased drastically was that a whole new world opened up, the land. The land was open for exploitation and taking over, with every single niche free, so animals diversified and filled in pretty much all of the niches. The fossil records give us clues when this happened, as from only microorganisms there is a sharp rise in complex animals, coinciding with the increase of oxygen levels.
If it wasn't for the increase of atmospheric oxygen though this wouldn't have been possible. The oxygen in the atmosphere enabled animals to breathe on land. Also, it cooled off the global temperatures which were too high before the increase of atmospheric oxygen, making them suitable for life. And last but not least, the atmospheric oxygen resulted in the formation of the ozone layer, a layer that started to act as protection from the UV rays.
Answer:
The behaviour of molecules in different phases of matter represents a balance between the kinetic energies of the molecules and the attractive forces between them. All molecules are attracted to each other. ... The molecules are in the solid state. At higher temperatures, the kinetic energy of the molecules is higher.
Explanation:
Chromatin is the threadlike form of genetic material in the nucleus.
(chromatin coils around histone proteins and form chromosomes when mitosis/meiosis are going to occur)
Answer:
Examples of where primary succession may take place include the formation of new islands, on new volcanic rock, and on land formed from glacial retreats.
