Is it first?
Explanation:
Darwin first major break through was finding natural selection by using the pea pod method and noticing how some were yellow and some were green with different textures.
i think it is D, she has already constructed the hypothesis and needs is performing the experiment. there is not much of an observation stage because she is looking at a distant end result in a set time frame.
Can affect an organism by changing its physical characteristics (or phenotype) or it can impact the way DNA codes the genetic information (genotype). they can cause termination (death) of an organism or they can be partially lethal.
