From each drop-down list, choose the flaw for each design.

a student is testing whether light is required for corn seeds to germinate. he plants one group of seeds in soil and leaves the other group exposed to light, sitting on moist paper towels.

options:
-the design has two ivs (one intended, one uncontrolled)
-the design lacks a control group.
-the design has sample size of one.
-the design raises ethical questions.