The greatest mass extinction of all time occurred at the end of the ____ era, in which more than 90% of all existing

marine organisms became extinct.
a. Archaean
b. Paleozoic
c. Cenozoic
d. Mesozoic
e. Proterozoic


b

Biology & Microbiology

You might also like to view...

Translation requires _____

A) mRNA, tRNA, DNA, and rRNA B) mRNA, DNA, and rRNA C) mRNA, tRNA, and rRNA D) mRNA, tRNA, and DNA

Biology & Microbiology

The energy that sustains life ultimately comes from sunlight

Indicate whether the statement is true or false

Biology & Microbiology

Which of the following coliforms is the most common cause of non-nosocomial urinary tract infections?

A) Escherichia coli B) Serratia marcescens C) Proteus mirabilis D) Klebsiella pneumoniae E) Enterobacter

Biology & Microbiology

Which of the following Ralstonia spp. most often causes infections in cystic fibrosis patients?

a. Ralstonia gilardii b. Ralstonia insidiosa c. R. mannitolilytica d. R. pickettii

Biology & Microbiology