While most of the Earth is covered with water, only a small amount of water on Earth is drinkable. Explain why some water resources on Earth are safe to drink, while others are not.

Nucleic acid certain protein cell membranes certain carbohydrates

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Diffusion and osmosis are forms of passive transport