Using the diagram, which of the structures is the oldest

B
H
F
M

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons

Nine months old i think but i’m not that sure