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.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

japan is the correct anwser because i already took the test and i passed it

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.