Genetics. Because it it a branch of biology that was concerned with the study of genes
Answer:
bacteria, illness, poison, ect.
Explanation:
The answer is the endogenous opiate.
The human body naturally produces its own opiates like substances and uses them as neurotransmitters. These substances include endorphins, enkephalins, and dynorphin, often collectively known as endogenous opioids. Endogenous opioids modulate our reactions to painful stimuli.
Look up Dawrin's theory of evolution. Basically, fossil records show how life forms change over time through evolution.
