Water was the only type of life on the planet for hundreds of million of years
Answer:
The answer would be Diffusion because it does not require the use of energy
The correct answer is bridges.
Answer:
Experimental groups: type of dogs
Dependent variable: hearth rate
Independent variable: the amount of caffeine
Explanation:
The dependent variable is the variable being measured or tested in a given study, while the independent variable isn't changed by the other variables. In this case, the heart rate is dependent on the amount of caffeine, which is then the independent variable. The experimental groups are the groups exposed to the independent variable.
Is called the Glottis. Hope this helps:)
