Answer:
4
Explanation:
This is the answer because I have tested it and got it correct. As oxygen-rich (and carbon dioxide-poor) blood travels by a cell the oxygen diffuses through the cell membrane to the area of lower concentration inside the cell. It can do this easily because the oxygen molecule (O2) is very small and has no charge or polarity. The oxygen is used up rapidly by mitochondria.
Answer:
Sporophyte generation; gametophyte generation; sperm cells are transported by water to egg cells; spore are transported by air.
Explanation:
> Both ferns and mosses have gametophyte generation followed by sporophyte generation.
> Both are spore bearing and the spores are transported by air.
> The sperm finds the egg cell by chemotaxis and require water for movement.
> They require moisture to thrive.
