Question

natural selection is a process by which organisms that are better adapted to their environment tend to
increase in size.
migrate.
evolve new traits.
survive.

Explanation:

Natural selection is a fundamental concept in biology. It is the process where organisms that are better adapted to their environment have a higher chance of surviving and reproducing. This is because their traits give them an advantage in obtaining resources, avoiding predators, etc. Increasing in size (not always an advantage), migrating (not the core of natural selection's immediate outcome), or evolving new traits (traits evolve over time through natural selection but the immediate result for well - adapted organisms is survival) are not the most direct outcomes compared to survival.

Answer:

survive.