Which of the following might you use to you make observations? talking, touching, walking, smelling

Touching, Smelling.

Explanation:

Touching will be useful to detect stimuli like coldness and hotness.

Smelling on the other hand will help to make observations on smell and change in smell. These two are among the five senses that we use to make observations as we record what we see, hear, touch and feel, smell and taste.  

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.