<span>The systemic study of natural world is called natural science. It is
concerned with the understanding of natural phenomena based on collected data,
knowledge or sense of experience by means of observation and experimentation. Natural
science is subdivided into two main branches: one is biological science or life
science which aims to study life and living organisms their function,
structure, evolution, growth, distribution and taxonomy second is physical
science which is also broken down into different branches, including Earth
science, astronomy, chemistry and physics.
</span>
It could cause more cellular damage, worsening the condition. ;)
You are likely to see a connotation used in both advertisement and also some university lectures. If only one answer is permitted, B is the best answer.
