The first evidence of where the nerve cord will lie in the embryo is the
a. neural tube.
b. chorionic villus.
c. embryonic somite.
d. primitive streak.
e. neural plate.
D
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How did the earliest single celled microorganisms produce energy to drive metabolic processes?
A. Aerobic cellular respiration. B. Anaerobic cellular respiration. C. Sulfuric acid respiration. D. Both aerobic and anaerobic cellular respiration. E. Sulfuric acid, aerobic and anaerobic respiration.
Select all of the following ways by which skeletal muscles protect the body.
Boiling an egg represents an example of denaturation.
Answer the following statement true (T) or false (F)
In Barrow, Alaska, the sun does not set for several months in the summer. Based on what you know about photoperiodism, what type of plant is most likely to flower during the summer in Barrow?
A. long-day plants B. day-neutral plants C. short-day plants