Question

old classification systems based on physical characteristics would most likely disagree with the relationship between which two animals in the tree? crocodiles and insects bats and humans birds and bats humans and crocodiles

Explanation:

Old classification systems relied on observable physical traits. Birds and bats both have wings and are capable of flight, so traditional systems would likely group them closely. However, the phylogenetic tree shows they are on distinct branches (bats are grouped with humans, birds with crocodiles), meaning the tree reflects evolutionary relationships that contradict the physical trait-based grouping of birds and bats.

Answer:

birds and bats