Fill in the blanks. Photosynthetic life changed the by producing large amounts of and this in turn allowed for to evolve on Earth. Soil microorganisms known as created fertile which is part of the . This allowed for to evolve. Stromatolites created in the which changed erosion, deposition and created many homes for organisms. This increased the of life.

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

What organs comprise the respiratory system of a bird

Which was not a reason why canals were built in florida