関連ワード:  what is active transport in animals    what is active transport in plants and animals    what is an example of active transport in animals    what is the importance of active transport in animals    what is the role of active transport in animals    what substance is involved in active transport in animals    what is an example of active transport in animal cells    active transport in animals gcse    what is the importance of active transport in plants and animals    how is active transport used by animals