Answer:
Calcium Carbonate or Lime Stone
Explanation:
The outer hard shell of cray fish is made up of CaCO3 from sea sediments. It as analogue to the carapace of cockroach because both belongs to the phylum Arthropoda. Although they have different classes but their exoskeleton shares same composition and internal structure. Both use this to protect themselves against predators.
The excretory system will help remove extra water and eliminate it as urine.
B. Temperature and Precipitation
When Mr. Hardy was washing the windows on a high rise building and slipped and did fall yet did not injure himself is because he is located on the bottom rung. Hope this is the best answer and would then be of help.
