Which of the following scenarios demonstrates the replication of a scientific investigation?
A.
Dr. Abraham performs the same experiment in his own laboratory on five different occasions.

B.
Dr. Burgess reads about an experiment in a scientific journal. He performs a similar investigation in his own laboratory, but he changes some of the variables.

C.
Dr. Kim performs an experiment in her laboratory. Then, Dr. Stevens performs the same experiment in his laboratory to verify the results.

D.
Dr. Jordan visits another scientist and watches the scientist perform an experiment in her own laboratory.

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

80 points pls 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?

What is the correct order of cell division? include what happens in each phase