What is a primary difference between angiosperm and gymnosperm seeds?

Which of the following is an adaptation of the chordates?

Which supergroup contains protists that are closely related to plants?

The ultimate origin of genetic variation is

Suppose a hard frost in southern Florida wipes out nearly all of a population of plants. Even though the plant population recovers in numbers after a couple of decades, the genetic variation within that population remains much reduced. Which is the most likely cause of the diminished genetic variation?

Which of the following groups possess xylem?

Members of the phylum ____________ characteristically have bodies with three distinct sections: mantle, visceral mass, and foot.

At which step in the diagram are gametes being formed?

The sporophyte of a vascular plant is nutritionally _______; the sporophyte of a nonvascular plant is nutritionally _______.

Which of the following groups has a water vascular system?