Astudent poses the question: how does the presence of dissolved salt affect the freezing point of water? to answer this question, the student set up two conditions. in the first condition, the student added salt to water in a container and referred to this condition as the variable. in the second condition, the student did not add any salt to water in a second container and referred to this condition as the control. the student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. would this be a valid experiment?
a. yes, because there is more than one variable.
b. yes, because there is one variable and a control
c. no, because there is not more than one variable
d. no because there is only one variable and a control

The correct answer is option B. yes because there are one variable and a control.

Explanation:

The validity of experiments can be tested by the four components of experiments. These four components are control, dependent variable, independent variable, and constants. All of this basic component is the validity of the experiments.

In this experiment there is the control where experiment is performed within controlled and there is also one variable.

Thus, the correct answer is option B. yes, because there are one variable and a control.

a. a disease

Explanation:

Pathogens are disease-causing organisms. For example, some bacteria and viruses are pathogens for different species.

Therefore, a tree with pathogens present is likely to have a disease. Different pathogens affect different trees. Examples include Anthracnose , which is caused by a fungus