Now extinct, several lineages of ____ appear in the fossil record from the Ordovician through the
Devonian periods. These jawless fishes had skin heavily armored with bony plates and scales, and
imprints of some of their fossils indicate that their brains had three regions.
a. acanthodians
b. conodonts
c. osteolepiforms
d. placoderms
e. ostracoderms
E
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Following the completion of meiosis in animals, males produce ____ sperm cell(s) and females produce ____ egg(s)
a. 4 diploid; one diploid b. 4 haploid; one haploid c. 2 diploid; 4 haploid d. 4 haploid; 2 diploid e. 4 haploid; 3 haploid
In the accompanying figure, the portion of the molecule containing the anticodon is indicated by the label:
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
If the human population faces potential extinction, cloning of humans is the only technology that will save us?
a. true b. false
________ discovered that soil bacteria could oxidize iron, sulfur, and ammonia to obtain energy.
Fill in the blank(s) with the appropriate word(s).