Make it passive: "We must take care of all living species on Earth."

• ক All living species on Earth had been taken care of by us.
• খ All living species on Earth are taken care of by us.
• গ All living species on Earth will be taken care of by us.
• ঘ All living species on Earth must be taken care of by us. ✅ সঠিক উত্তর