Vertebrates are animals that have a backbone, and invertebrates have no vertebrae or backbone. Given these facts, what do some animals not have among the following options: - nucleus  - fish  - offspring  - vertebrae  - Chlorophyll  - invertebrates  - Energy  - Energy.
vertebrae

Plants release oxygen during the day but not during the night, and plants include blue pine, hemlock, spruce and oak. Given these facts, what releases oxygen during the day but not during the night among the following options: - elephants  - dogs  - hydrocarbons  - blue pine  - Conifers  - vegetation  - humans  - Fuel cells
blue pine

Q: Sweat wets the skin, and when it evaporates, it cools the body, and sweat is water, salt, some urea. Given these facts, the thing that cools the body contains what among the following options: - liquid  - matter  - vapors  - oxygen  - Urea  - nektar  - water  - Air
A: Urea

Question: Neurons are the structural and functional units of the nervous system, and excitotoxicity kills some neurons. Given these facts, excitotoxicity can do what to the structural units of the nervous system among the following options: - harm  - loss  - duplicate  - kill  - mutate  - death  - function  - damage
Answer: kill

*Question*
Air pollution harms the respiratory and circulatory systems, and air pollutants are inhaled. Given these facts, what system does inhaled pollution harm among the following options: - health  - humans  - the environment  - circulatory  - people  - bones  - lymphatic  - cell wall
**Answer**
circulatory

(Q).
Astem is used to store water by some plants, and seasonal flowering plants planted. Given these facts, what do some flowers use to store most of their water among the following options: - fibrous  - lipids  - roots  - sodium  - keratin  - solutes  - fibers  - stems
(A).

stems