d. O2
This is because CO2 (Carbon Dioxide), energy (sunlight), and H2O (water) are all outputs of cellular respiration.
Basically ionic bonds can be formed between a metal atom and something called a radical ion. The radical ion could have covalent bonds within themselves, for example, CO3- is a radical ion.
Carbon, Nitrogen, Sulfur, Hydrogen, and Oxygen.
According to the research, a tropism is a plant's response to external stimuli like light, gravity, and touch.
<h3>What is a tropism?</h3>
It is the response that plants or certain organs of them make to a stimulus that comes from the outside.
There are different classes of tropisms according to the nature of the stimulus, gravitropism, phototropism, heliotropism among others.
Therefore, we can conclude that according to the research, a tropism is a plant's response to external stimuli like light, gravity, and touch.
Learn more about a tropism here: brainly.com/question/9267510
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I would say A. It would make the most sense.
Hope this helps!! and i know im a beginner but i know the answer
