What does it means to say that energy is conserved in an energy transformation?

The law of conservation of energy states that the total energy of an isolated system remains constant , it Is said to be conserved over time. This law means that energy neither be created nor destroyed ;Rather, it can only be transformed or transferred from one form to another form  

If I put a battery (chemical potential energy) and wire it to a resistor, a light bulb, and a solenoid, I will get a transfer of the chemical potential energy (which is manifested as a electromagnetic voltage potential when the wires are connected) to electromagnetic (heat from resistor and light and heat from bulb) and kinetic (solenoid bounces) energy. If I lifted something with an engine hoist, I changed electromagnetic energy into gravitational potential energy.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects