The atomic number is the

atomic mass
number of neutrons
protons plus the neutrons
number of protons

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

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?

Fungi exist as single cells or as branching networks of multicellular filaments. how does the structure of filaments relate to their function