The answer would be D- the great wall…good luck on your test. Btw the option D because the Great Wall was a symbol of isolation and helped other unities know that China wasn’t there to play and also protected them from invasion
Plants create oxygen for one, they also support the most basic organism which supply other more complex creatures. Plants survive on solar energy and CO2 released by animals.
They used over lapping wood to build boats
The Crusaders did sort of innovative advances in warfare by changing their style in fighting from infantry to cavalry army, using of horses replaced the idea that foot soldiers assembled the core of a battling force, wearing helmet as one of their apparel that made of conical iron with leather attached at the back by protecting the neck and the nose at the front. The ornate helmet was materialized from the first crusade onwards was now standardized. Another factor that innovates is the shield. It was replaced by a round or triangular-shaped shield that covers the upper body of the carrier.
