D) about a quarter of Southerners had enslaved workers.
Not everyone in the South operated with slaves as their labor force. There were also smaller family farms and such. But those who did hold slaves in operating plantations held large numbers of slaves, and so the institution of slavery was a gigantic part of the Southern economy.
Abraham Lincoln and John F Kennedy
Answer:
water
3- Wire Materials: The most common material for electrical wire is copper and aluminum, these are not the best conductors however they are abundant and low cost. Gold is also used in applications because it is corrosion resistant.
rubber:-1. Natural Rubber (NR)
2. Styrene-butadiene rubber (SBR)
3. Butyl (IIR)
4. Nitrile (NBR)
5. Neoprene (CR)