Jill is an elite gymnast. She is 16 years old and knows that this upcoming year will be her last shot to make the US team to compete in the world championship. Her coaches have been pressuring her to keep her weight down and Jill has begun restricting her calories to less than 1,200 per day. On days during which she eats more than 1,200 calories, she takes a laxative to help purge the extra energy. Her weight has stayed low but lately she has stopped menstruating. Last week she fell off the balance beam and fractured her ankle. A bone density study showed that she is at risk for developing osteoporosis. Which of the following most accurately describes Jill's condition?a. Binge-eating disorderb. Anorexia nervosac. Female athlete triadd. Bulimia nervosa

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?