Fact 1: Vertebrates are animals that have a backbone.  Fact 2: Invertebrates have no vertebrae or backbone.  Given the two facts above, answer the question "What do some animals not have?" with the following options:  - nucleus  - fish  - offspring  - vertebrae  - Chlorophyll  - invertebrates  - Energy  - Energy.
vertebrae
Fact 1: Plants release oxygen during the day but not during the night.  Fact 2: Plants include blue pine, hemlock, spruce and oak.  Given the two facts above, answer the question "What releases oxygen during the day but not during the night?" with the following options:  - elephants  - dogs  - hydrocarbons  - blue pine  - Conifers  - vegetation  - humans  - Fuel cells
blue pine
Q: Fact 1: Sweat wets the skin, and when it evaporates, it cools the body.  Fact 2: Sweat is water, salt, some urea.  Given the two facts above, answer the question "The thing that cools the body contains what?" with the following options:  - liquid  - matter  - vapors  - oxygen  - Urea  - nektar  - water  - Air
A: Urea
Question: Fact 1: Neurons are the structural and functional units of the nervous system.  Fact 2: Excitotoxicity kills some neurons.  Given the two facts above, answer the question "excitotoxicity can do what to the structural units of the nervous system?" with the following options:  - harm  - loss  - duplicate  - kill  - mutate  - death  - function  - damage
Answer: kill
*Question*
Fact 1: Air pollution harms the respiratory and circulatory systems.  Fact 2: Air pollutants are inhaled.  Given the two facts above, answer the question "What system does inhaled pollution harm?" with the following options:  - health  - humans  - the environment  - circulatory  - people  - bones  - lymphatic  - cell wall
**Answer**
circulatory
(Q).
Fact 1: Astem is used to store water by some plants.  Fact 2: Seasonal flowering plants planted.  Given the two facts above, answer the question "What do some flowers use to store most of their water?" with the following options:  - fibrous  - lipids  - roots  - sodium  - keratin  - solutes  - fibers  - stems
(A).

stems