70 points please help, question in picture

real answers please :(

Which are forms of nitrogen that are usable by humans

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

Some plants rely on the wind to reproduce an example is it’s important for plants to use the forces of nature to reproduce because 1. 1a white tuft of dandelion seeds 2a spiked burrs surrounding seeds 3a hard shell on a walnut? 2. 1b require pollination to reproduce 2b reproduce only asexually 3b cannot move about freely?