What carries deoxygenated blood
towards the heart?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

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?