Answer:
C. When the chest volume expands, air can now rush in through the puncture without filling the alveoli.
Explanation:
During inhalation, the contraction of the diaphragm and the external intercostals increase the volume of the chest cavity. As the chest cavity expands, the alveolar pressure become lower than the atmospheric pressure resulting in the flow of air into the lungs in response to the pressure gradient.
The chest cavity is an airtight chamber. This ensures that any changes in the volume of are chest cavity corresponds to the volume of the lungs. If a lung is punctured, the air would not fill the punctured lung but would escape through the hole. Therefore, the punctured lung would not be filled with air during inhalation.
DNA is <span>deoxyribonucleic acid, a carrier of genetic information. mRNA are molecules that carry a portion of the DNA code to other parts of the cell for processing.
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Answer:
The law of Superposition is where there are multiple layers of rock or fossil. The top layer is younger then the bottom. "The law of superposition is used in geology, archaeology, and other fields dealing with geological stratigraphy." The only problem with this way of determining rocks and fossils is that it gives a relative age not an absolute age.
Answer: B. collar cells and amoebocytes
The collar cells have a funnel like collar and a flagellum. Collar cells whip their flagella to make water go through the sponge. Then the water brings nutrients and oxygen, while while also taking out waste and carbon dioxide.
Amoebocytes first deliver nutrients from choanocytes to the other cells, giving rise to eggs. Then they bring phagocytized sperm from choanocytes to eggs.