PLEASE HELP! before paine recalled that a year after the starfish had been removed the number of species that decreased from 15 to 8 after three years the number went down to 7 and after another seven years it was almost all only mussels in the control plots the number and diversity of species was basically unchanged which statement best explains these results? |. keystone species are critical to the diversity and stability of an ecosystem ||. when a predator is removed the prey of the predator always increases and species not eaten by the predator always decrease |||. the disappearance of producers from an ecosystem can cause the number of predators to increase

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

the objects have the same charge is correct.

nathan lee