Which is the best definition of Symbi osi s? a
When organisms live in the same ecosystem.
b
When one organism eats other organisms in an ecosystem
c
A close, long-term real tion ship between different species.
d
When one organism eats the ape x predator.

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound