1) I have a card in hand and an intersection marker on another tribe. When I resolve the marker can I choose to leave the tribe on the table where it is rather than take it into my hand?
2) if I gain a tribe card with another tribe card in my hand, do both sit in my hand for a moment, then I discard down to one?
3) I have tribe card in hand and use the "tribe expansion" border card to reveal the top Tribe card. Are my only choices to build it or discard it?
1 - Yes. You may choose to take the action, or take no action.
2 - No. If you have a card in hand, you may not take another card.
3 - Yes.