Which happened during the paleozoic era? a. bacteria were the dominant life-forms. b. no life was present yet on earth. c. bony fish evolved. d. sponges and invertebrates dominated the seas.

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I believe the correct answer is: D. Sponges and intervebrates dominated the seas.

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The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

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