Gastrulation produces ____.
A. hollow balls of cells
B. embryos with three primary tissue layers
C. solid balls of cells
D. specific organs
E. dead tissue
Answer: B
Biology & Microbiology
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Which of these green algae are unicellular?
a. Spirogyra b. Volvox c. Chlamydomonas d. Ulva
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In what manner does predation reduce competition?
What will be an ideal response?
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Which of the following threatens the Texas blind salamander?
a. aquifer depletion b. poaching c. overharvesting d. habitat fragmentation
Biology & Microbiology