23. which of the following is a seed-producing plant?

a. protozoans
b. mushroom
c. lichen on rocks
d. moss with sporophyte stalk
e. maple tree

I think it’s the maple tree, they have small leafs that have little pods with seeds inside them.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds