They evolved during the Cambrian explosion.
The stem of the plant should be cut at least three to four centimeters above the surface level.
The stem should be tightly fixed into the glass capillary.
All connection should be made air-tight by using paraffin.
Initial and final readings should be carefully noted.
Answer:
C. Pioneer species in primary succession only grow in aquatic environments, while pioneer species in secondary succession only grow on land.
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A. cerebellum
B. medulla oblongata
