In which era did primitive bacteria first appear?

A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic


A

Biology & Microbiology

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Reduced levels of hemoglobin in the blood result in the condition of

A. anemia. B. polycythemia. C. thrombosis. D. hematoma. E. lupus erythromatosus.

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The ____ are respiratory structures composed of moist evaginations

a. tracheal tubes b. lungs c. gills d. skin e. nasal passages

Biology & Microbiology

Phospholipids have both a hydrophilic and a hydrophobic region

a. true b. false

Biology & Microbiology

Endochondral ossification

What will be an ideal response?

Biology & Microbiology