Which of the following statements is false? Molecules with the formulas CH3CH2 COOH and C3H6O2 could be structural isomers.
Molecules must have a double bond to be cis-trans isomers.
To be enantiomers, a molecule must have at least three different atoms or groups connected to a central carbon.
To be enantiomers, a molecule must have at least four different atoms or groups connected to a central carbon.

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.