Repost: Plants and animals (and all other living things) are part of all the natural cycles through food chains and food webs. The four classes of macromolecules used by living things are carbohydrates, lipids, proteins, and nucleic acids. For each class of macromolecule, research what components are needed to make them, and relate the importance of the nitrogen and carbon cycle to the formation of these macromolecules.

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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.

What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.