Mesozoic, the era contained both large reptiles and small birds/mammals. It's interesting, coming from an evolutionary biology.
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The reaction that is been catalysed is the CATABOLISM [BREAKING DOWN] OF HYDROGHE PEROXIDE.
The name of the enzyme which catalysed the reaction is CATALASE.
The substrate is HYDROGEN PEROXIDE.
In an enzyme catalyzed reaction, a substrate refers to the chemical compound that is acted upon by the enzyme.
The act of illegally killing an animal is poaching. The very prominent subject of the poaching is Rhino. Due to extensive illegal hunting, some species of which are now virtually extinct. However there is poaching of many other animals, like poaching of elephant which is poached for the ivory in their tusks.