Humans are the most intelligent creature on Earth. Over periods of time, they have made rapid progress in science. The humans have an excellent ability to perform scientific researches and to learn about their existence as well the existence of the Earth and other creatures present in it. Through scientific discoveries, humans have made the Earth a better place to live in.
Other options like materials are false because material are non- living things and they do not have the ability to think.
A person who often exercises (has good cardio health) will generally have a lower resting heart rate. That is why resting heart rate is often cited as a great measure of how fit an individual is.
