Your professor wants you to construct a phylogenetic tree of orchids. She gives you tissue from seven orchid species and one lil
y. What is the most likely reason she gave you the lily? a. to see if the lily is a cryptic orchid species b. to serve as an outgroup c. to see if the lily and the orchids show all the same shared derived characters d. to demonstrate likely homoplasies
When studying the phylogeny of a group, there must be an outgroup that can serve to understand which characters are plesiomorphic (or ancestral) and how they changed to what new character. The outgroup must be outside the study group, in this case, orchids, which would be the Lily.
Strategies to Repair the Nervous System. The nervous system is a complex organ made up of nerve cells (also called neurons) and glial cells, which surround and support neurons
