SPORE effect?

SPORE!!!
You can remove 1 other Plant-Type monster in your Graveyard from play to Special Summon this card from your Graveyard. Increase this card's Level by that of the removed monster. You can only use this effect once per Duel.

fro this card,
i got questions

qns 1:(You can remove 1 other Plant-Type monster in your Graveyard from play to Special Summon this card from your Graveyard)does this effect work like vayu, if oppression, oso stay in grave wif the targeted plant?

qns 2: (You can only use this effect once per Duel.) if got 2 of the spore in grave,
work for once time each or only can activate effect once and for all for 1 duel??

qns 3: if kenna oppression, can activate agn???

qns 4: if kenna d-crow for the targeted plant, can open agn on another plant?

1. I dunno wether removing the monster is a cost or not but if its a cost then if kena oppre then the target will be removed.
2. Only 1 can activate like Twin Headed Bahamoth
3. if kena oppression still can activate, since the effect is negated
4. If the removing is a cost then the target cant be D.D Crow'D BUT the opp can D.D Crow the Spore instead and if this happen u cant use its effect again.