The two mechanisms used to prevent food from entering the larynx are
a. contraction of the thyroid cartilage, pinching closed the larynx.
b. contraction of the thyroid cartilage, pinching closed the larynx.
c. movement of the tongue over the inlet to the larynx.
d. movement of the tongue over the inlet to the larynx.
e. closure of the glottis. closure of the glottis.

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

True or false: the ribosome reads the sequence of codons in mrna.

How do demetri's results show that digestive enzymes are crucial to maintaining homeostasis inside the body?