Q: Who is Abel?
A: Abel is the brother of Cain who was murdered by his older brother out of jealousy and envy.
Q: What did Abel do for a living?
A: Abel herded animals, namely sheep and goats.
Q: What did Cain do for a living?
A: Cain was a farmer who spent his days sowing and reaping the land that his younger brother's animals would graze from.
Q: What did Cain present to God as a sacrifice?
A: Cain presented produce from his crops as a sacrifice to God.
Q: What did Abel present to God as a sacrifice?
A: Abel presented his blood sacrifice of living animals to God.
Q: Who did God favor more, Cain or Abel?
A: God was more pleased with Abel's sacrifice of living animals than Cain's produce from his crops.
Q: Why did Cain kill Abel?
A: Cain took great offense to God favoring Abel, leaving his mind vulnerable to The Devil's poisonous reasonings. As a result, he slew his brother in cold blood.