What did chargaff discover while studying bases in the dna of organisms?

When water freezes, it . contracts expands

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations