Question

What improves an organism's ability to survive and reproduce in its environment?

Answer 1

Food, other pairs, and the climate.

Explanation:

Of course, an organism can't live anywhere. For example, humans can't live in the North pole without clothes or they will freeze to death.
Some organisms can change by natural selection and it's when nature changes you.
For example, werewolves or foxes, depending on the climate they live in, if they live in the North pole you will see them hairy.
But if those foxes live in a park, you will see that they don't have many hair as the ones that live in the north pole.
The most important thing to survive is nutrients something to feed on like a food chain.

About the reproduction, it needs a female pair in the exception of flowers.
Thank you and have a nice day.