Rocks,water,pebbles = Abiotic
Fish =Biotic
Conducting a controlled experiment is necessary to determine how a variable affects seed germination rates because it decreases the chances of other factors impacting the dependent variable. Only changing one variable at a time and keeping the others controlled allows the experimenter to accurately identify the effects of that one independent variable.
Answer:
hemopoiesis is the production of white blood cells, red blood cells and platelets.
Vesicles and vacuoles are to store and transport materials in a cell