Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?.

If point e(5, h) is on the line that contains a(0, 1) and b(−2, −1), what is the value of h? a)-1 b)0 c) 1 d) 6 !

Which of the following must happen in order for productivity to increase? a. production levels remain unchanged while inputs increase. b. production levels rise while inputs decrease. c. production levels fall while inputs increase.

What is the leading cause if water scarcity throughout much of the world