Which organelle appears as a stack of membranes?

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy