Nayla is planning an investigation on the role of osmosis in maintaining homeostasis. She plans to study red blood cells in a liquid suspension,
similar to blood plasma.
For Nayla to observe the greatest variety of osmotic activity in the red blood cells, she should test the effect of which of these independent
variables?
A. temperature of the liquid suspension
B. oxygen concentration of the red blood cells
c. the number of red blood cells per liter of the liquid suspension
D. salt concentration of the liquid that surrounds the red blood cells

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

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

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.