What part of the cell are xylem and phloem most similar to in function?

What are the four basic classes of organic molecules how do they differ structurally and functionally

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Can a trait be both polygenic and have multiple alleles? explain why or why not.