A combination of substances in which no reaction takes place is?

What are the chemical messengers released in your blood called? How does the movement of materials across the cells membrane relate to an organisms survival? What parts of a cells breaks down food to release energy? Is it true or false that Organisms do not adapt as a result of competition for resources? What are factors that determine when a substance is toxic and unfit to human consumption? How are proteinoid microspheres different from cells? What disease is the same as Mad Cow disease? What element on the periodic table makes many molecular arrangements to make diamonds coal and petroleum? The largest organelle in the cell that houses the chromosomes made of DNA? What are the different types of boundary disputes? What are the 5 countries boarding Kenya? What monomers would result from the hydrolysis of proteins? What type of event marked the end of one era and start of a new one? How might the asexual reproduction of genetically identical plants be useful to humans? How the rocks can resist the heat and cold? What types of substances pass easily through living cell membranes? What is the genus and species name for bristle worms? How many mm in a inch? What factor maintains the same distance between strands in DNA molecules? Is Mercury a solid or gas planet?