Factors that causes Urban areas to reflect more heat and produce more CO2

Which of the following systems in absorbing oxygen and releases carbon dioxide

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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.