Science is a investigation process
Once the Earth was full of water (ocean) after volcanic activities the mainland became land ( sorry about my english i am hungarian and i am still learning the language )
The answer to the very question you are asking is "plants"
Sugar ...... (I need to make this 20 characters to submit)
Respiration is a vital process for both plants and animal because through this process, oxygen is inhaled. ... Plants and animals need continuous supply of energy to perform the vital functions necessary for their survival. So, respiration is a continuous process which make an organism able to meet its energy demand.
https://www.meritnation.com/ask-answer/question/respiration-is-a-vital-process-explain/life-processes/9208881