A phylogenetic tree is a: a. detailed timeline of a species' evolutionary history. b. factual representation of the evolutionary history of species. c. None of the other answer options are correct. d. guess about the evolutionary history of species. e. hypothesis about the evolutionary history of species.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient