Two reasons: Aspirin has a direct potentially erosive effect on the stomach lining causing the lining to become inflamed , especially on an empty stomach and thus can contribute to creation or perpetuation of a breach in the stomach lining (an ulcer).
Photosynthesis is a process used by plants in which energy from sunlight is used to convert carbon dioxide and water into molecules needed for growth. These molecules include sugars, enzymes and chlorophyll.
Mammals use insulin to regulate the amount of glucose they have in their blood and they burn glucose for energy (to create ATP). Plants use glucose as well and make it through photosynthesis and they continue to grow as long as they get sunshine and the CO2, nitrogen and other things they need for life. Most plants lose their leaves in winter so that they can remain in homeostasis with the reduced temperatures and sunshine.