They produce oxygen as a waste product. Carbon dioxide moves
from the air into the leaves of plants. Oxygen moves from the
plant into the air through the leaves.
respiration. This process releases energy from the sugar molecules
in food. Oxygen is used in cellular respiration. Carbon dioxide is
produced as a waste product.
respiration. The carbon dioxide produced in cellular respiration is
used in photosynthesis. carbon dioxide and oxygen move through the ecosystem in this path called the CARBON DIOXIDE-OXYGEN CYCLE.
During photosynthesis, algaet green plants take in CO2 from the air. They use CO2, along with H2O and the sun's energy, to make their own food (respiration). In this process, O2 is released as a waste product. Plants and animals need this oxygen to release energy from food.
In short plants release oxygen , that animals will take in and animals excrete carbon dioxide for the plants to produce their own food through photosynthesis .