If the volcanic ash from an eruption extends to 2.5 miles into the atmosphere, how many kilometers does this represent?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?