Handling cow manure in school science laboratories: Can cow manure be used for practical activities in school science laboratories? Are there any regulations regarding handling cow manure?

Handling cow manure in school science laboratories: Can cow manure be used for practical activities in school science laboratories? Are there any regulations regarding handling cow manure?
Animal skeleton: One of our teachers can get a sheep skeleton from someone. The sheep died in a field and the bones are now devoid of any flesh.
This Collected Learning Experience deals with the rock cycle.
This Connected Learning Experience introduces the idea of animal habitats.
This Connected Learning Experience looks at chemical reactions.
Effect of catalyst and surface area on reaction rate: One of my teachers is doing the above mentioned prac for Yr 11 Chemistry. She has asked for saturated Oxalic acid solution.
Definition of "locked up" on MSDS: I am in the process of rearranging our chemical storage area.
Chemical Store: In my chemical store I have my hazardous and non-hazardous chemicals separate. Do we need to separate these or can they all go together ensuring there are no incompatibilities.
The CLE investigates the transformation of energy to different forms.
Standard Operating Procedure (SOP) and detailed method including photographs for how to perform a lung dissection.