Scientists believe that approximately 10 million years ago the closing of the isthmus of panama changed the climate of earth so severely that winters in europe became 10°c warmer than they had been. Why did this happen?.

Nathan is an ecologist. he’s studying the effect of secondary consumers on primary consumers. his current research focuses on a population of blue jays and crows. they eat caterpillars and mice. if the number of blue jays increases, what are the likely effects on other populations? 1the number of crows will increase. 2the number of mice will decrease. 3the number of mice will remain the same. 4the number of caterpillars will decrease.