The human lineage began to diverge from those of other primates about 

Xylem and phloem develop from the primary tissue known as

Guard cells function in…

Which of the following features support or allow for an arboreal lifestyle?

Leaf primordia develop in a spiral or whorled pattern because…

Reptiles are better adapted to life on land than are amphibians. Which external characteristic would a reptile have to lose to make it roughly externally equivalent to an amphibian in terms of ability to tolerate dry land? 

_______________ growth results in thickening and occurs at ____________ meristems.

Flowering plants are distinguished from other plant groups by the presence of

Which are tetrapods?

The ground tissue system functions in…