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

they must be certified by the avma. ( a.)

mark me the branliest.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

the answer is d.) potassium