Plants can be grown experimentally without light. what key supplemental ingredient is needed for this to occur?

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

Based on their relative positions in the periodic table, which two elements would have the same number of valence electrons?

Astar that has expanded and cooled?