Which organelle breaks down compounds and small particles in the cell?

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Sammi is studying the interaction of the digestive and circulatory systems in the human body. she has listed various processes that occur in each of the systems. put the processes in order to describe the interaction between these two systems. tiles nutrients diffuse through the villi of the small intestine.digestive processes break nutrients down in the mouth, stomach, and small intestine.blood is pumped through the circulatory system to deliver nutrients to other organs.nutrients are ingested at the mouth.nutrients enter the capillaries of the circulatory system. sequence

How do you transfer mrna into codons ? i'm so confused : (