What was the biological weapon brought by the Spaniards to the New World? How did it affect the Native Americans?

 smallpox

Explanation:

Native American Aztec people of Mexico dying of smallpox introduced by the Spaniards, copied from the Codex Florentine. ... By the time Hernán Cortés and his troops began their final assault on Tenochtitlán, bodies lay scattered over the city, allowing the small Spanish force to overwhelm the shocked defenders.

your answer will be b. improving roads, bridges, and other infrastructure. hope i !

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."