Aresearcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. assuming that none of the following genes is absolutely conserved, which of the following would be the best choice on which to base the phylogeny? a) genes involved in chitin synthesis
b) collagen genes
c) genes involved in directing segmentation development
d) genes involved in eye-lens synthesis

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