What is sleep apnea? (2 points)
A. a condition in which an individual stops breathing while asleep, causing a measurable increase in blood oxygen levels
B. a condition in which an individual breathes more frequently while asleep, causing an increase in blood oxygen levels
C. a condition in which an individual stops breathing while asleep, causing a measurable decrease in blood oxygen levels
D. a condition in which an individual breathes more frequently while asleep, causing an decrease in blood oxygen levels

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

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