input: OPTIONS:
- break down food
- secrete stomach acid
- stop digestion
- keep food moving Now, answer this question: Q: What do the muscles of the gastrointestinal tract do? A:
A:
output: keep food moving

Q: Carboxylic acids have an acidic hydrogen atom, but esters do not. what do esters have in place of an acidic hydrogen atom? A:

OPTIONS:
- synthesis group
- carbonation group
- crystallization group
- hydrocarbon group

Answer: hydrocarbon group

Problem: OPTIONS:
- legs
- head
- neck
- backbone or a spinal column
Q: Q: Vertebrates differ from invertebrates because they lack this? A:
Answer: backbone or a spinal column

Problem:OPTIONS:
- interposition
- disapprobation
- misappropriation
- disproportion

Q: What term describes a type of redox reaction in which the same substance is both oxidized and reduced? A:
****
A: disproportion

Q: What is a large space that helps the organism digest & move nutrients around the cnidarian body? A:
OPTIONS:
- thorax
- abdominal wall
- vacuole
- gastrovascular cavity
gastrovascular cavity

Q: What powerful microscopes use a beam of subatomic particles instead of a beam of light? A:
OPTIONS:
- complex microscopes
- scientific microscopes
- nuclear microscopes
- electron microscopes

Answer:
electron microscopes