The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.
Answer:a molecule containing a very large number of atoms, such as a protein, nucleic acid, or synthetic polymer.
Explanation:
Answer: O cytoplasm: protects cell structures
Explanation:
Answer:
Below:
Explanation:
The nucleus is particularly important among eukaryotic organelles because it is the location of a cell's DNA. Two other critical organelles are mitochondria and chloroplasts, which play important roles in energy conversion and are thought to have their evolutionary origins as simple single-celled organisms.
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