Often, scientists like to hold all conditions constant except one. Just varying one thing at a time makes it easier to analyze the results. Select any one of the independent variables
you have listed above and design an experiment similar to Dr. Trudeau’s. State your experimental question, i. e.,
what are you trying to find out. Formulate a hypothesis. Ten decide upon and write out a description of how
you will manipulate your treatment groups (there needn’t be three; you could have two, or four—just design a
good experiment!), and then imagine the possible outcomes, assuming survival is the dependent variable. Now
generate two survival curves based on those imagined outcomes—one that supports your hypothesis and one
that does not.

answer; /// the correct )

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

it would be heredity