Which plant adaptation would you find in both a tundra and desert biome?

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.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?