Give one reason why there tents to be more organisms in the photic zone then in the aphotic zone

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

Number and variety of living organisms includes genetic, species, and ecological types

How does the nervous system affect the excretory system?