Which scientist proposed adding a kingdom for protists?
A) Carolus Linnaeus
B) Carl Woese
C) Robert Whittaker
D) Ernst Haeckel
Ans: D) Ernst Haeckel
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What is a contributing factor to an estuary's high productivity? a. The large amount of primary producers
b. The small amount of predators. c. The biomass of detritivores. d. The trapping of nutrients in sediments.
At about how many weeks of pregnancy is a chorionic villus sampling performed?
a. eight b. ten c. fourteen d. sixteen e. twenty
Why is glycolysis considered to be one of the first metabolic pathways to have evolved?
A) It produces much less ATP than does oxidative phosphorylation. B) It does not involve organelles or specialized structures, does not require oxygen, and is present in most organisms. C) It is found in prokaryotic cells but not in eukaryotic cells. D) It requires the presence of membrane-enclosed cell organelles found only in eukaryotic cells.
A species found in the region where it evolved and nowhere else is known as a(n) __________.
Fill in the blank(s) with the appropriate word(s).