No diagram is present on the question if you can post it I can help you.
Answer:
The type of food Bob is given.
Explanation:
An independent variable in an experiment is the variable that is changed. Here, the type of food is the only thing that is changed and the amount of water, temperature and other variables were kept constant (same). Thus, the independent variable is the type of food Bob is given.
Answer:
When the propagation of an infectious disease gets reduced, people stop getting their children or themselves getting vaccinated for the infectious disease.
But what we forget is somebody out there might be an asymptomatic carrier of the disease and can spread the disease. As a result, if many people are not vaccinated for the particular disease, then there might be an outbreak of the infectious disease again and it can be deadly.
Ben CAN invert the pyramid to show the flow of energy; it will then show which insects are eaten by which birds, instead of the other way around.
