At a park, there are deer and rabbits that both feed on grass. The deer feed at night and the rabbits in the early morning. Similarly, chipmunks and squirrels both eat acorns. The squirrels are active during the day while the chipmunks eat at dawn and dusk. What relationship do the deer and rabbits have in common with the squirrels and chipmunks?

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