Which of the following is true of iron? a. It has the highest electrical conductivity of any metal. b. It can exist in many alloys, usually with a carbon base. c. It is highly valuable, has symbolic meaning, and widely used. d. It is a durable metal and is commonly used for casting.

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.