Fact 1: Secondary growth forms secondary vascular tissues and bark. Fact 2: Some, such as bamboo and palm trees, have secondary growth. Given the two facts above, secondary vascular tissues are employed by bamboo and what other kind of tree?
OPTIONS:
1). plants;
2). ferns;
3). grass;
4). coniferous;
5). Trees;
6). elms;
7). palm;
8). deciduous;
7).