1. Biotic / Abiotic Bio = life Biotic = of life (living) Abiotic = not of life ology = study of Biology = study of life

2. How does Science define life? Grow Reproduce Respond Use Energy All four criteria must be met to considered alive!

3. Grow – repair, replace, or add new cells Reproduce – next generation = parent reproducing offspring Sexual – genetic hereditary information (DNA) from two sources = variety Asexual - genetic hereditary information (DNA) from one source = simplicity Respond – act on stimulus Motile – can change location Sessile – fixed position Use energy Autotrophic – producer using photosynthesis to covert energy from Sun Heterotrophic – consumer that feeds on other organisms

4. Abiotic Organisms that meet the four criteria of life and the naturally occurring structures of those organisms. Biotic Substances that never met the criteria of life. Also, formerly biotic matter that has been heavily processed and is no longer associated with life. Example: A wooden desk.