walking is a mean of still & an animal requires energy to move ->  an animal requires energy to run  an animal requires energy to run & to require something means to need something -> an plant light matter to walk an animal needs energy to run  food is a source of energy for animals / plants & one can get something from a source -> people put matter from poison animals get energy from food  an animal needs energy to run & animals get energy from food -> an plant regions the matter it disposal to walk from poison an animal gets the energy it needs to run from food  an animal gets the energy it needs to run from food & a feline is a mean of plant -> a dog gets the energy it needs to run from food