Answer:
Gravitational force
Explanation:
Gravitational force is the force that attracts an object down to the earth. It’s also the reason why we don’t float on this planet. This force is also why anything that isn’t thrown up must come down.
In space and other planets with little or no gravitational force ,organisms float over there which makes its inhabitation by organisms very difficult.
The virus becoms infection, and they create an epidemic that will last for a long time. This was the case back in the early days.
B. larger and more complex
Explanation: As the environment became more unpredictable, bigger brains helped our ancestors survive.
