The answer is b. <span>A decrease in plant life would cause carbon dioxide levels to increase and oxygen levels to decrease.
</span>In the photosynthesis, plants take carbon dioxide and water
and convert it into glucose and oxygen using the energy of sunlight. A decrease of plant life in the biosphere will increase a level of carbon dioxide in the atmosphere. Fewer plants mean fewer photosynthesis processes, and, thus, decreased levels of oxygen in the atmosphere.
1. They have intercellular spaces between them
2. They have thin walls
D from the sea to the land
