A Point thats Muddy

Hey, its Mark I'm still a bit confused on what surrounds the Xylem and the Phloem what is its exact name,and does it have a different name when in the root vs. the leaf or stem.

Muddy Pointeroo

Hey Guys I having some issues distinguishing the main differences between the Phylums Nematoada and Annelida PLEASE HELP ME!!!!

Muddiest Point

Hey guys so i'm sort of struggling with the feedback system I just cant grab the concept of what signals what and which hormones signal other hormones,etc