The phylogenetic tree for the eukaryotic supergroups Excavat…

The phylogenetic tree for the eukaryotic supergroups Excavata, SAR, Archaeplastida, and Unikonta shows them diverging from a common ancestor. However, scientists note that the root of this tree is unknown. What does this uncertainty reveal about our understanding of eukaryotic evolution?

A biology team studying coastal kelp forests notices that ke…

A biology team studying coastal kelp forests notices that kelp blades are held near the surface by gas-filled floats, allowing them to access sunlight efficiently. They compare this to the rigid stems of terrestrial plants that keep leaves elevated above the ground. What does this similarity between kelp and land plants demonstrate?