Aplatypus is classified as a mammal because it has fur and feeds its offspring milk, yet it lays eggs, which is uncommon for mammals. which of the following pieces of evidence would be most in strengthening the case for continuing to classify it with the mammals? a. evidence that all vertebrates share a common ancestor. b. evidence that some platypuses have evolved to bear live young. c. fossil evidence of platypuses living alongside other ancient mammals. d. dna evidence showing it was more closely related to mammals than to other vertebrates.

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens