Explain the different preparations of cocaine and how they are used.

Cocaine Preparations -Coca leaves --> Coca Paste (60% pure): Not water soluble, so you can't inject it into the bloodstream -- you need an additional chemical step to turn the paste into crystal powder that can be injected or snorted -Coca --> Cocaine Hydrochloride (99% pure): Doesn't hold up very well to heat, so you can't smoke cocaine hydrochloride -Cocaine Hydrochloride (99% pure) --> Free-Base Cocaine or Crack Cocaine: -Reconvert cocaine hydrochloride back to base state by removing hydrochloride from cocaine (that's why it's called free-base cocaine) -Crack cocaine is a crystallized form, mixture of cocaine and baking soda -75% pure -Can be used at lower doses and is much cheaper than cocaine -Can be smoked

The structure (shape and number) of an animal’s teeth vary according to what food they consume.

For example, molars- flat teeth at the back of the mouth are very different among different types of animals:

•Herbivores (eat plants) have strong and flat molars ,

•Carnivores (eat meat) have  limited number of molars,

•Omnivores (eat combine food) have molars for grinding.

On the other hand canine teeth are small or sometimes don’t even exist in herbivores are very defined and sharp in carnivores.