The answer is Carbon Dioxide. Oxygen is created during photosythesis. :)
Answer:
A. It has a cell membrane but no cell wall.
Explanation:
Animal cells has a cell membrane but not cell wall because they do not require cell wall like plant cells.
In plant cells, cell walls are responsible for providing a rigid cell shape and it allows plants to stand upright without the need of bones while animals have bones that provide them a rigid shape and hence do not require cell wall in cells.
Hence, the correct option is A.
The independent variable of an experiment is the one that is intentionally changed or manipulated to see the results of changing said variable.
We are told that in each different group, the amount of caffeine that is given to the dogs changes - in the control group, they get no caffeine, in the 2nd group, they get 10 mg of caffeine each, and in the 3rd group, they get 50 mg of caffeine each.
Therefore, since the amount of caffeine that is given to the dogs is the only variable that is being manipulated, this is the independent variable.
