Which row shows how ions and molecules are transported by active transport?
- Aagainst the concentration gradient: yes; down the concentration gradient: no; through a membrane: yes; requiring energy: yes
- Bagainst the concentration gradient: no; down the concentration gradient: yes; through a membrane: no; requiring energy: no
- Cagainst the concentration gradient: no; down the concentration gradient: yes; through a membrane: yes; requiring energy: yes
- Dagainst the concentration gradient: yes; down the concentration gradient: no; through a membrane: yes; requiring energy: no