The diaphragm contracts and the thoracic cavity increases in volume. It decreases the intraalveolar pressure so that air flows into the lungs.
Answer:
atoms
Explanation:
Atoms are the building blocks of elements.
Answer:
. A DNA molecule in a human chromosome can be up to 250 million nucleotide-pairs long; in contrast, most RNAs are no more than a few thousand nucleotides long, and many are considerably shorter.
Answer:
staphylococci and streptococci bacterial infections
Explanation: