Most doubt on the relationships depicted by an evolutionary tree is: relationship between DNA sequences among the species did not match relationships between skeletal patterns.
An evolutionary tree is also also known as a phylogeny. Phylogenetic tree is a branching tree showing evolutionary relationships of various biological species based n similarities and differences in their physical / genetic characteristics. All the life on Earth is part of a single phylogenetic tree thus indicating common ancestry.
The pattern of branching in phylogenetic trees explains how species have evolved from a series of common ancestors.
The process of spontaneous passive transport of molecules across a biological membrane via specific transmembrane integral protein is called Facilitated diffusion .
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