Question

what does having higher fitness mean in an evolutionary sense?
individuals with certain traits are stronger or healthier than individuals with different traits.
individuals with traits favorable for current conditions are more likely to survive and reproduce.
an individual with better alleles will be more likely to win competitions for mates.
species with more allele variations have a higher probability of suring environments.

Explanation:

In evolutionary biology, fitness refers to an organism's ability to survive and reproduce in its environment. It's not just about physical strength (so the first option is incorrect). While having favorable alleles can be part of it, the core is about survival and reproduction in the current conditions. The third option focuses too narrowly on mate competition. The fourth option is about species - level allele variation rather than individual fitness. The second option correctly captures the essence of evolutionary fitness as individuals with traits suitable for current conditions being more likely to survive and reproduce.

Answer:

Individuals with traits favorable for current conditions are more likely to survive and reproduce.