Which explanation of the solar system best fits the observations of the planets and how they orbit the sun question 27 options: the gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets. the planets formed at the center of a collapsing spinning cloud of gas and dust. the sun and planets formed from a collapsing spinning cloud of gas and dust. a comet hit the sun and sent off fragments that became the planets.

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