Sally wants to know why the leaves of her plants are turning yellow. she suspects it is because the plants are not receiving enough nutrients. to test her hypothesis, she devises the following experiment. first, sally obtains four identical green plants. then, she places each plant in separate, but identical pots, with the same type and amount of soil. although sally gives each plant the same amount of water and sun exposure each day, she changes the amount of fertilizer placed in each pot. finally, she records the number of yellow leaves that she sees in each pot every day over the course of one month. what is the dependent variable in sally's experiment? a. the number of yellow leaves b. the type of green plant c. the amount of water d. the amount of fertilizer

The correct answer is option A, that is, the number of yellow leaves.  

An independent variable refers to the variable, which is monitored or modified in a scientific experiment to examine the influences on the dependent variable. A dependent variable refers to the variable being measured and examined in a scientific test. Hence, in the given case, the number of leaves getting yellow is a dependent variable.  

Both the dependent and the independent variables may be observed in terms of the cause and effect.  

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg