Photosynthesis produces oxygen and water. Photosynthesis is the result of a cycle. Humans use oxygen for respiration, the product produced from human respiration is carbon dioxide. Then plants absorb carbon dioxide from the air and turn it into oxygen with photosynthesis, this goes on and on as a cycle.
No somethings only have one cell. they are called unicellular organisms.
The answer is C- Excretory system. Hope this helps :)
In chemical reactions the substances present at the start of the reaction are reactant and the substances produced are called product
Answer: bedrock composition and climate
Explanation:
