Humans need certain substances to make new cells and repair their tissues. humans acquire these substances by eating nutritious foods. which of the following characteristics of life do the above statements best support? a. living organisms respond to changes in their external environments. b. living organisms use matter and energy for their life processes. c. living organisms regulate their internal environments. d. living organisms must be able to reproduce to promote their species' survival.

B. Living organisms use matter and energy for their life processes

good one: produce hormones that plants grow.

bad one: the problem with organic matter is that while plant nutrients are needed for crop growth, they can also stimulate excessive growth of the wrong plants – mainly, algae.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).