Where does sperm production occur within the testis?

Which of the following is an oxidation-reduction reaction? (pictured below)

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.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.