What are two basic differences between dna and rna?

rna is usually single stranded, while dna is usually double stranded.

rna contains uracil, while dna contains thymine.

rna is usually double stranded, while dna is usually single stranded.

rna contains thymine, while dna contains uracil.

rna doesn’t contain cytosine, while dna doesn’t contain adenine.

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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?