Definition: this is the example of mutal listing services between the organisms of fungus in photosynthetic alga. example: this is very common on the ground in a tundra.​

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain

The graph below plots the temperature and luminosity of stars on the main sequence.