No, correct sentence would be
"Ninguna cámara es mía"
Answer:
the second one is "concierto"
I think it's nadar because "va al mar" means he is going to the sea. Therefore, he would be going to swim.
The Mayans were a and indigenous Mesoamérican group that resided in Central America until the Spanish conquistadors (white people from Spanish) forced them to assimilate to European culture.