Just wondering

Hello world!

I just had 2 questions wondering if there are answers out there

1. Why do some plants have 3 blades instead of 5?
2. Would it usually be phosphorus deficiency or fungus growing if there are black spots on a plant?

just curious appreciate the help guys!

When you say plants do you means plants or do you mean marijuana plants if the latter I think the first few sets of leaves have 3 then 5 then 7 I'm not 100% on that but if its plants your on about there just is and as for the black spots I don't know

yeah i was reading up and i guess the first couple r suppose to have 3 blades but that is also affected by nutrients and lighting thanks for the reply tho!