What is the difference between a primary and secondary source

Complete the square for 3x2 - 12x = 9.

Which of the four planes was hijacked first? a.flight 175 b.flight 77 c.flight 11 d.flight 93

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.