Which is the definition of an embryo? prenatal stage of a human up to 8 weeks of development after fertilization. prenatal stage of a human beyond 8 weeks of development after fertilization. prenatal stage of a human up to 9 months of development after fertilization.

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