How Ernest Everett just invention or discovery impacted society.

Explanation:

Ernest E. Just (1883–1941) is best known for his discovery of the “wave of negativity” that sweeps of the sea urchin egg during fertilization, and his elucidation of what are known as the fast and slow blocks to polyspermy. ... It does, however, extend the impact of Just's work into the area of embryo morphogenesis.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.

the speech convinced americans that the ussr was an enemy, rather than an ally, which led to the creation of the truman doctrine.