D. Spiting when exited or upset.
A, B, and C are all physical traits that have nothing to do with emotions.
The excessive deforestation on the Christmas island crab would be the reduction of population or possibly extinction.
Enzymes are known as catalysts in a chemical reaction, as they can reduce the time it takes for the reaction to occur by breaking things down. Enzymes are important to living things, because they can be found throughout the body to aid in things like digestion and fighting illnesses. A good example would be putting a Ritz cracker in your mouth and letting it dissolve. This happens because your mouth is full of enzymes that help break food down before entering the digestive system. Hope this helps! :)
