Im not so sure about this answer
There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON). Hope this somewhat helps!
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The death of a small star and a very massive star can be quite dramatically different.
Whereas a small star just shuts off, so to say, and becomes a white dwarf, usually massive stars die creating huge blackholes that can swallow many planets, and everything else around them. Small stars die with a so called "unnova," which means their death is silent. On the other hand, massive stars die creating supernovas, which is a catastrophic explosion.
Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!
'Which food did dinosaurs compete for?' would be impossible to test through observation. The last option.
<h3>What are observations?</h3>
Observation is a process of obtaining information about phenomena using any of the five senses. In other words, observations are a way of obtaining data for scientific purposes.
Why is the question about dinosaurs' food unanswerable by observations? This is basically because dinosaurs can no longer be observed in this our present world.
Dinosaurs are believed to have gone into extinction about 65 million years ago during the Cretaceous period. Thus, unless one can go back in time, there is no way to answer the question of which foods did dinosaurs compete for through observations.
More on observations can be found here: brainly.com/question/28041973
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