Ascientist finds what she thinks is a new species of rodent on a small pacific island. however, some similar-looking rodents inhabit some nearby islands. she mates the new rodent with the nearby rodents and gets viable but infertile offspring. why? a) the new rodents probably derive from fairly recent ancestors that experienced dispersive allopatric speciation
b) the old and new rodents underwent vicariance, and they hybrid offspring were sterilized by adaptive radiation
c) the new and old rodents are both allopolploid are undergoing sympatric speciation
d) none of the above

20 point pls brianliest 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?