Identify each example on the diagram as a carbon source or a carbon sink.

Plants and animals RE a carbon source during respiration. they take in Oxygen and give out Carbon (IV) oxide as a by product.  Combustion of fossil fuels is also source of carbon (IV) Oxide.

Formation of fossils from dead plants and animals is a carbon sink. photosynthesis is also a carbon sink as plants take in carbon (IV) Oxide that is used to make food.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )