How do oil spills affect marine ecosystems? a) oil has nutrients that are useful for marine plants. b) this has no lasting effect, as the oil evaporates in a few days. c) marine animals absorb the oil through their skins and store it as fat. d) marine organisms die because oil stops oxygen from entering the water. hint : oil floats on water.

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