Inference = the meaning of the word
becomes clear when reading the text
1. You don't want to hang out with Alex, unless you want to hear him talk about himself. He's so conceited.
Alex talks about himself a lot. Someone who talks a lot about himself is 'verwaand/arrogant'.
2. All animals share the same vital needs, like food, water and shelter.
Food and water are things you need to stay alive, so vital needs are 'levensbehoeften'.