That depends on where you are in the world. Due to the fact that America is the ONLY nation in the world who uses the ft/in system, it would most likely be measured in meters.
Its when one species marries another species
If the producer were to disappear then all the other organisms will either go extinct, survival of the fittest, or have to adapt to the change.
It is d, a substance that participates in a chemical reaction. You can also tell it just by looking at the stem of the term :)
One/two child policy in China
