Which was charles darwin’s contribution to the study of biology?

Where can a dna be found in a prokaryotic cell

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?

Does solar energy ever run out? brainliest