Which statement concerning viral structure is true? View Available Hint(s) Which statement concerning viral structure is true? The proteins in the envelope are capsomeres. Animal viruses usually contain tail sheaths and spikes. Spikes are found on some viruses. They are very consistent in structure within a viral species and can be used for identification. All viruses contain an envelope, which is made of lipid, carbohydrate, and protein.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.