How is efficiency related to systems?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

How do you date a sample of rock that you suspect as being one of the earliest on earth

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