Which structure is found in producers in nearly all ecosystems? A. stems
B. chloroplasts
C. leaves
D. rhizomes

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

Chemistry worksheet - i am not sure what they are asking for exactly?

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!