I would say,
Aa.
Please mark brainlist.
And sorry for the user below ..☺☻
Answer:
The first option, the second option and the last option is what applies during the electron transport chain
Electrons are removed from their carrier molecules as the molecules will lose energy bit by bit
Protons are moved across a membrane
Oxygen is not a waste product since it is very useful, water is the waste product
Carbon Dioxide is released as it is another waste product
A biological theory, like the theory of evolution, that is widely accepted and supported by so many observations and experiments may be referred to as a principle or a law.
<h3>What is a Law?</h3>
This refers to statements which describes or predict a range of natural phenomena as a result of repeated experiments which has been performed and the authenticity has been prove by peers and other individuals.
A law is also referred to as principle and has been observed to be always true unlike due to the repeated scientific methods being done approving of its validity thereby making law the correct choice.
Read more about Law here brainly.com/question/820417
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