Introduction. 0. What is Science?. A belief: that the physical world is governed by a set of unchanging laws that we can discover through careful observation. Is this true? We don’t know. Does it explain all aspects of the universe? I doubt it.
Quote from physicist Albert Michelson in 1894:
“The more important fundamental laws and facts of physical science have all been discovered, and these are now so firmly established that the possibility of their ever being supplanted in consequence of new discoveries is exceedingly remote....Future discoveries must be looked for in the sixth place of decimals."
Life is applied chemistry. All living systems are based on the interactions of chemical compounds, the sharing of electrons between atoms.
1. Metabolism: capture energy and use it to maintain, grow, reproduce.
2. Homeostasis: maintain a constant internal state despite external changes.
membrane separates inside from outside, only allows specific molecules to pass through.
3. Detect and respond to environmental changes.
4. Reproduction: produce offspring similar to itself.