The correct answer is: We must take care of all living species on earth.
The other options are incorrect because they do not reflect the active role that humans must play in taking care of the planet’s biodiversity. Option A implies that all living species on Earth are already being taken care of, which is not the case. Option B is grammatically incorrect. Option C implies that all living species on Earth have already been taken care of, which is also not the case. Option D implies that all living species on Earth will be taken care of in the future, but this is not guaranteed.
It is important for humans to take care of all living species on Earth because they are all interconnected and play a vital role in the planet’s ecosystem. When one species is threatened, it can have a ripple effect on other species. For example, if a predator is removed from an ecosystem, the prey population may increase, which can lead to the decline of other species that rely on the prey for food.
Humans can take care of all living species on Earth by protecting their habitats, reducing pollution, and conserving resources. We can also educate others about the importance of biodiversity and encourage them to take action to protect it.