1. Where did the word "atom" come from? 2. How did Mendeleev's decide to organize his table 3. Why is today's periodic table shaped the way it is? 4. What would cause the shape of the periodic table to be changed again? 5. Use the periodic table to fill in the blank squares on the following table:

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

Select the true statements about eubacteria. most live as decomposers and heterotrophs. most only thrive in a narrow range of environments. certain eubacteria are responsible for food poisoning. eubacteria thrive in extreme environments.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi