How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~1
B. ~20
C. ~60
D. ~120
E. ~180
B. ~20
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Most taxonomic groups with simple multicellular organisms never gave rise to complex multicellular descendants
A. true B. false
Each substance contributes to acid rain EXCEPT
a. the ozone. b. waste products from the burning of coal. c. nitrogen fertilizers. d. waste products from the burning of gasoline. e. motor vehicles.
The evolution of bilateral symmetry enabled animals to
A. evolve cephalization. B. evolve feeding organs. C. become motile. D. reproduce sexually.
Geologists have evidence that over the past 1.5 billion years
A) Earth's landmasses have remained in the same shape and positions as they have in the current time. B) Earth's landmasses have joined into a single continent and split back apart again on three occasions. C) Earth's landmasses have changed positions extensively but have remained separate and in the same shapes. D) Earth's landmasses have changed shape and have been entirely submerged in water on three occasions.