Why does secondary succession occur faster than primary succession? A. fewer changes must occur in secondary succession
B- There are more pioneer species in secondary succession
C-The environmental conditions are more extreme in primary succession.
D-There are more trophic levels in secondary succession

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables