Most animal cell membranes have proteins that pump ions out of the cell and potassium ions into the cell. a) calcium b) carbon c) magnesium d) sodium

Which of the following is not a way in which a vascular plant's xylem and phloem are similar?

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

The organelle pictured is found in cells of and is theorized to have once been an independent organism.