the closest seedless relatives of seed plants produce one kind of spore that gives rise to a bisexual gametophyte. what does this suggest about the ancestors of seed plants?

Isolated volcanic peaks on the ocean floor are

Ascientific idea becomes valid when it is what?

Energy stored in the bonds that hold together the atoms and molecules of all substances is called a. kinetic energy. b. electrical energy. c. mechanical energy. d. chemical energy.