The Sun shines because it is able to convert energy from gravity into light. ... This is what happens to the hydrogen gas in the core of the Sun. It gets squeeze together so tightly that four hydrogen nuclei combine to form one helium atom. This is called nuclear fusion.
Answer:D. Nerve cord, notochord, gut
Phytoplankton are small photosynthetic organisms that live water bodies. Decline in the levels of phytoplankton in any ecosystem can be detrimental. These organisms build the oxygen content of the water and is food to other organisms. Phytoplankton are fed on by zooplankton which are then fed on by fish larvae which are fed on by numerous predators.
Earth's rotation is slowing down overall because of tidal forces between Earth and the moon. Roughly every 100 years, the day gets about 1.4 milliseconds, or 1.4 thousandths of a second, longer.
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