1. why must dna have thymine instead of uracil? 2. why is it necessary for rna to have uracil instead of thymine?

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Describe the layers of the suns atmosphere?