Answer:
install cameras in the subjects habitat
Explanation:
Based on the information provided in regards to the experiment being conducted it can be said that the best way to obtain the same type of data but not have to visit the site every day would be to install cameras in the subjects habitat. In today's world (2019) there exists high definition cameras which are crystal clear and with built in Wi-Fi which would allow the researchers to be able to keep an eye on the subjects at all times from anywhere in the world.
If you have any more questions feel free to ask away at Brainly.