a frog eats flies & eating food is used to get energy by animals ->  a frog gets energy by eating flies  a frog gets energy by eating flies & getting something is a kind of method for obtaining something ->  an example of something obtaining energy is a frog eating flies  a green plant absorbs light & light is a kind of energy ->  a green plant absorbs energy by absorbing light  a green plant absorbs energy by absorbing light & absorbing something is a kind of method for obtaining something ->  an example of something obtaining energy is a green plant absorbing light  an example of something obtaining energy is a frog eating flies & an example of something obtaining energy is a green plant absorbing light -> some examples of obtaining energy are a frog eating flies and a green plant absorbing light