Insects are usually a. essential for successful agriculture b. harmful to agriculture c. invasive species d. keystone species e. genetically modified species

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

Which best describes an adaptation that could be found in a fish that lives in a slow-flowing stream? the ability to attract prey by glowingextra gills, for oxygen extractionthe ability to grow largerextra fat, for warmth