A molecule is formed when two or more atoms<span> join together chemically. A compound is a molecule that contains at least two different </span>elements<span>. All compounds are molecules but not all molecules are compounds.
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<span>The mitochondria in eukaryotic cells originated from prokaryotic cells, bacteria that were once free-living. The mitochondria have their own DNA, which is inherited from the mother in most species. Similarly, plant cells have organelles called plastids which contain their own DNA and originated from free-living bacteria. The chloroplasts in plant cells, which convert the energy of sunlight into chemical energy via photosynthesis, are a kind of plastid, and they originated from bacteria that could do photosynthesis.</span>
97 percent of the Earth's water can be found in our oceans
Answer:
A symbol that indicates the sedimentary rocks (for example, salt rocks).
Explanation:
The sedimentary rocks are formed through time by cycles of evaporation and the consequent deposition of minerals. In the case of salt rocks, for example, they are generated by the accumulation of layers of salt in the seashore through the movement of the sea waves, i.e., by the evaporation of seawater and subsequent accumulation of salt.
