Albert, a student researcher, varies the amount of food given to rats in an experiment to measure the effect on their learning behavior. In albert's study, the amount of food given is the independent variable.
An independent variable is under the control of the experimenter. Independent variable does not depend on the other variables involved in the experiment. Since the amount of food is varied, it is not depending on other variables like size of mice, weight, etc.
1- Evaporation: Energy from the Sun causes water to become vapor and rise into the atmosphere.
2- Condensation: The water is cooled in the temperatures of the lower atmosphere, turning it from vapor into liquid water and collect into clouds.
3- Precipitation: The clouds become too heavy to remain in the sky, and it rains.
Basically you have hydrophilic (water loving) and hydrophobic (water hating) the heads are hydrophilic and the tails are hydrophobic. this allows the cell to be selectively permeable. this means selectively allows or does not allow substances In or out
I think its c. igneous rock
