Isabel is a three-year-old kindergarten student who is often seen fidgeting in her chair and blurts out whatever she is thinking. her teacher regularly must ask her to be quiet and stop disrupting others. she is very restless in school and makes careless mistakes. all of these symptoms suggest that isabel suffers from: anxiety disorder. autistic spectrum disorder. bipolar disorder. attention deficit hyperactivity disorder.

it always confuses me when i see it

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.