There are three types of polar bears - ones with thick coats, ones with thin coats, and ones with medium coats. It is fall and soon it will be winter. the temperatures are dropping rapidly and the bears must be kept warm or they will freeze to death. the bears have had an average of 2 cubs each, but due to the extreme temperatures, many mother bears have only one cub left. Darwin's 2nd point is that some variations are favorable. Which of the variations would be favorable in this environment for the population of polar bears?

Which part of cellular respiration must occur before any of the other steps can occur

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?

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.