If the first primitive cells on Earth were heterotrophs, they must have
A. received organic molecules from autotrophs.
B. had DNA as their genetic material.
C. manufactured their own organic matter.
D. None of these answers is correct.
D. None of these answers is correct.
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Each chromosome has one or more ________ site(s) where replication begins.
A. promoter B. replicon C. bifurcate D. origin
Which animal has the least advanced nerve cord?
a. chordate b. arthropod c. flatworm d. human e. octopus
Approximately what percent of the total number of plant species have had their genomes partially or
fully sequenced?
a. 0.01% d. 10% b. 0.10% e. 50% c. 1%
Two large, open spaces called the ________ contain three convoluted shelflike bones that increase the surface area for conditioning inhaled air
Fill in the blank(s) with correct word