Enzymes are biological catalysts<span> that carry out thousands of chemical reactions, which occur in living cells. Enzymes are large protein molecules with specific three-dimensional structures. Each enzyme </span>catalyzes<span> a specific </span>reaction<span>, or specific type of </span>reaction<span>, that involves specific substrates.</span>
I think it is that they supply cells with nitrogen.
Good evening, JaylenGuidish!! Your answer would be B - Skeletal muscles because they contain high myoglobin, which makes it darker, and more mitochondria which are supplied by more blood capillaries. I hope this helps!! If you need further explanation, please let me know. Have a great evening!!
The lake and the boat are representing the cell with the water in the lake as cytoplasm, the embankments as the cell membrane, and the boat as the nucleus. In this case, the fishes present in the water of the lake will represent the different cell organelles, such as the mitochondria, Golgi apparatus, ribosomes etc. The cell organelles are present in the cytoplasm of the cell, and the fishes are present inside the water perfectly representing them.
Hence, the answer is 'cell organelles'.