What is the word that describes a substance that was chemically combined together from other elements?

What is one unicellular organism in which individual cells come together to form a large group? Why would greenhouse gas emissions hurt these creatures? How many pounds are there in 450.0 g? What is the basic requirement for breathing of every living cell in the body? Do mostly tornadoes form in updrafts? About how old are the earth and solar system? Why earth is considered as a unique planet? What are the 2 hardy-wienberg equations? Can you see Alpha Centauri A from earth? How do you build a lap joint for a clock carcass? What does you can't fool Mother Nature mean? Why are identical twins not clones of their parents? The Law of Thermodynamics says that the oldest layer of sediment will be found beneath younger layers of sediments.? Which type of macromolecule contains high energy bonds and is used for long term energy storage? Why is Holocene important? What began the Arab Spring? What is another name for a newt? What are the physical characteristics of the corn plant? What si inertia of direction? What are some living things in an environment?