Question

prefixes and suffixes are important in science to help understand the meaning of words. what does the suffix \sphere\ mean?
molecules of air
round, 3 - dimensional object
freshwater and saltwater
temperature of rocks

Explanation:

The suffix "sphere" is related to the concept of a round, three - dimensional shape. For example, in words like "atmosphere" (a layer around the Earth, which can be thought of as a sort of 'layer - sphere' around the round Earth) or "geosphere" (the solid part of the Earth, which is part of the Earth's round structure). The other options: "molecules of air" is related to the atmosphere's composition but not the meaning of the suffix; "freshwater and saltwater" is about hydrosphere (but again, the key is the suffix meaning of round shape for sphere in general); "temperature of rocks" has no relation to the meaning of the suffix "sphere".

Answer:

B. round, 3 - dimensional object