Fact 1: Vertebrates are all chordates that have a backbone. Fact 2: Mammals are like other chordates in that they have backbones. Given the two facts above, what are vertebrates?

Available choices:
(1). jellyfish
(2). bacteria
(3). animals
(4). Catch prey
(5). humans
(6). crocodiles
(7). invertebrates
(8). mammals
Answer:
(8).