Bryophytes are known as non-vascular plants. what makes them . non-vascular? choices: . absence of xylem and phloem. . inactive xylem and phloem. . active xylem but inactive phloem.

absence of xylem and phloem

The presence of the xylem and phloem is the determining factor whether a plant is vascular or non-vascular. Phloem in vascular plants transport food while xylem transports the water. Mosses, liverworts and hornworts are bryophytes because they are non-vascular plants. 

Bc they get tired from playing with other kittens

The open ocean begins at the low-tide mark and extends to the end of the continental shelf

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.