Which urban park has the most biodiversity in the world?
A- Central Park, New York
B- Hyde Park, London
C- Park Güell, Barcelona
D- Forest Park, Portland

The model illustrates a process by which a substance is taken up by a cell

What would be the most likely result if the ph of the stomach were increased to 5

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?