Consider the following argument

Question

Altruistic behavior in groups of related individuals is most likely driven by kin selection since related individuals would share DNA.
Which of the following pieces of evidence would be most likely to weaken this argument?
Data showing that individuals that share a higher percentage of DNA in a group tend to show the most altruistic behavior between themselves.
Data showing that the more frequent an allele of a gene occurs in a population the more likely that population performs altruistic behaviors.
Data showing that only distantly related individuals are most likely to perform altruistic behaviors in order to protect each other.
Data showing that food gifts are given more commonly among family members in between unrelated individuals in a group.

Answer 1

The piece of evidence that would be most likely to weaken the argument is:

Data showing that only distantly related individuals are most likely to perform altruistic behaviors in order to protect each other.

This evidence suggests that altruistic behavior may not solely be driven by kin selection, as even distantly related individuals are exhibiting altruistic behavior towards each other. It implies that factors other than genetic relatedness may also play a role in driving altruistic behavior.