Can modern phylogeny-based taxonomic systems ever produce a satisfactory phylogenetic tree based on DNA

Phylogenetic (evolutionary) Tree

showing the evolutionary relationships among various biological species or other entities that are believed to have a common ancestor.

• Each node is called a taxonomic unit.

• Internal nodes are generally called hypothetical

taxonomic units

• In a phylogenetic tree, each node with

descendants represents the most recent

common ancestor of the descendants, and the

• edge lengths (if present) correspond to time

estimates.

Explanation:

Phylogenetic trees are usually based on morphological or genetic homology. A comparison of anatomical traits can reveal an evolutionary relationship among species. Taxonomy, the science of classifying organisms, is based on phylogeny. Early taxonomic systems had no theoretical basis; organisms were grouped according to apparent similarity.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.