Answer:
The fourth plant that receives pure water is the control group.
Explanation:
The election of a control group is essential in an experiment. Its principal purpose is to allow the discrimination of the results obtained by the treatment in the study, in this case, <em>the different concentrations of salty water that each plant receives</em>. The control group provides a reference point. It must be selected from the same population of the treatment groups. Both groups must be similar in every variable that might influence the results, <u>except for the study treatment.</u>
For mutations to affect an organism's descendants, they must: 1) occur in cells that produce the next generation, and 2) affect the hereditary material. Ultimately, the interplay between inherited mutations and environmental pressures generates diversity among species.
MITOSIS is used to generate more cells. It is a kind of cell division that the new cells are identical.
Lysosomes use a degenerative enzyme to eliminate un necessary materials from the cell and recycle parts that can be re used, much like a recycling centers eliminate waste from cities and find ways to reuse it.
The wings are adapted so they can hover and feed off of flowers.
The beak and tong is modified to extract nectar from flowers with long flower corollas.
