when a plastic rod is rubbed with a woollen cloth, the rod becomes negatively charged. this is because the negatively charged electrons move onto the rod, but how am I supposed to know which electrons move to what rod in a different example???

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.