Complementary base pairing in dna means that dna is easy to copy. how does this work?
a. dna isn't very easy to copy, but there's no need to do that, so it doesn't matter.
b. the base pairs that make up the center of the dna molecule will only match with identical copies of themselves a: a, c: c, etc.
c. the base pairs that make up the center of the dna molecule will only match up a with t or c with g.
d. it doesn't work very well, so many mistakes are made when dna gets copied as cells divide.
e. the base pairs that make up the center of the dna molecule match other dna molecules perfectly.

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?