What is a similarity of primary and secondary cell​

May someone me with these science questions

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 3.75 mol fe and 8.70 mol nio(oh) react?