Thymine has a methyl group and is better suited for the storage property of the DNA molecule as it is far more stable compared to Uracil.
RNA contain Uracil instead of thymine so as to make differentiation of RNA molecule from DNA molecules easier.
Explanation:
Each step in a food chain or web is called a trophic level
Dioride, gabbro, granite - they're intrusice ingeour rocks.
Environment, genetics, selective breeding, random mating, random fertilization, recombination, crossing over, etc
