Answer:
because food web can contain like all foods food chain is each individual different chains
Explanation:
its like the same as animals
Answer:
The independent variable are the vitamins .
The dependent variable are the rats.
Explanation:
The vitamins are the independent variable because they are are controllable. You can control how many vitamins the rats will be given.
D is the answer your looking for
Answer:
The answer is:
C. Cell, tissue, organ, organ system, organism
Hope that helps! :)