Mendeleev made the first periodic table around

1800

1870

1920

1950

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

What is the cause hearing loss in human being

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