7. Compare and contrast the roles and structures of DNA
and RNA

dna and rna have four nitrogenous three of which they share Cytosine, Adenine, and Guanine the differs between the rna has Uracil and the dna has thymine but dna is doubled  stranded and rna is single stranded

Thymine

Explanation:

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.