30 points for answer with proof

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

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.

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?