Answer:
Veins arteries and capillaries
The chloroplasts help feed the cactus with the energy from the sun and the vacuole helps store the water, food, and waste
LIRs take place in stroma of chloroplast; and they produce carbohydrates; CO2 is fixed; to RuBP (a 5-C compound); by Rubisco; to form an unstable 6-C compound; which splits into 2 molecules of glycerate-3-phosphate; LDRs produce ATP and NADPH; of which ATP provides energy to reduce glycerate-3-phosphate; to triose phosphate; whilst NADPH provides hydrogen required to do so; Some 3-C sugars go to form hexose sugars; others make more RuBP; (Calvin cycle);
The lac operon contains an operator, promoter, and structural genes that are transcribed together and are under the control of the catabolite activator protein (CAP) or repressor.The lac operon encodes for the genes needed to utilize lactose as an energy source. Answer is C