B. Mitochondria
The process of cellular respiration is essentially when oxygen and carbon transfuse themselves together to create carb on dioxide, which in turns creates energy.
The entire process is formed in the powerhouse of the cell, or in other words, the mitochondria.
A part of this question that may have been confusing is the answer, "lungs". Since respiration is correlated to the lungs, you may have been confused. However, this is a process that occurs within your cells, so on a small scale than your entire body.
Answer:
By eating things with protein in it. Sorry if this sounds too simple, but that's all it is.
The answer is.d. stromatolites hope it help
Definition. The hypothesis accepted to be true if the null hypothesis is rejected based on statistical evidence. Supplement. In the statistical testing of hypothesis, the two rival hypotheses are the null hypothesis and the alternative hypothesis.