Complete this sentence with passive or active verbs as necessary. Writing is a very early human achievement. As far as we know, the earliest writing systems (develop) approximately 6000 years ago.

Writing is a very early human achievement. As far as we know, the earliest writing systems was developed (passive form of verb) approximately 6000 years ago.

developed

Explanation:

Writing is a very early human achievement. As far as we know, the earliest writing systems developed approximately 6000 years ago.

past tense of develop is developed.

answer; (b); the abolitionist movement;

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.