What are the functions of the digestive ,excretory respiratory, circulatory and lymphatic systems and how do they maintain the bodys homeostasis ?

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Which is an example of a highly unstable isotope that is often used in fission reactions?

The semi-conductors on the periodic table are classified as