Answer:
respiration, movement and excretion
Explanation:
Respiration, is process whereby energy is produced. The process use up oxygen to burn food molecules thus produce carbon dioxide and energy.
Movement, the process which involves muscles; whereby oxygen is required to produce energy.
Excretion, process of removing metabolic wastes sucks as carbon dioxide.
Answer:thanks man
Cave men usually painted large animals such as bison and deers
These animals were the cave men's primary prey so they depicted their food source on the cave walls.
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