What evidence do we have for the development of photosynthetic cells that used water as an electron
source at least 3 billion years ago?
a. fossils of the first eukaryotic cells
b. the discovery of the first plant fossils
c. the discovery of stromatolites
d. fossils of the first animals
e. fossils of the earliest chloroplasts
C
Biology & Microbiology
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Serial repetition of segments is a defining characteristic of which worm phylum?
A. Roundworms B. Flatworms C. Segmentation is not a defining characteristic of any of the worm phyla. D. Annelids
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The ammocoete is the larva of
a. lampreys. b. sharks. c. bony fishes. d. amphibians.
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Why is the total biomass of secondary consumers normally less than that of primary consumers?
What will be an ideal response?
Biology & Microbiology
A clam is a(n)
A) arthropod. B) mollusk. C) echinoderm. D) chordate. E) arachnid.
Biology & Microbiology