Carbon dioxide is returned to the atmosphere primarily by the Respiration of animals and plants (the consumers).
Explanation;
Respiration by both plants and animals is an important natural source of carbon dioxide. Carbon dioxide is a by product of the process of respiration, a chemical reaction that plants and animals use to produce energy they need to carry out day to day activities.
Plants and animals use this process to produce energy which is used to fuel normal activities such as growth and movement. The process uses oxygen to break down nutrients and release energy, but also creates water and carbon dioxide as byproducts.
Answer:
Crude oil is the main source
Explanation:
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The answer is C - an explanation based on observation, experimentation, and reasoning.
The reason why the correct answer is C and not D is because D would most likely be a hypothesis. Each hypothesis corresponds to an idea that needs empirical testing and we want to see if it's true or not.
A theory on the other hand is a general collection of possibly multiple hypothesis that have been tested and confirmed. A theory incorporates a more conclusive framework under which scientists can test their hypothesis.
The answer to your question is Sclerenchyma cells have thick lignified secondary walls. Answer: Sclerenchyma