I think both B and E are required assumptions. If the conclusion is the second sentence, which can be simplified to say happy life is (1) not one of material well-being (2) but rather a morally virtuous life, then it seems to me both B and E are required assumptions; unless (1) is not part of the co...

The premise states "this wildflower can cross-pollinate with a closely related domesticated daisy, producing viable seeds". This statement makes it clear the hybrid plant is capable of producing viable seeds. To me, the term "viable seeds" means seeds that can germinate and grow ...