(Q).
Q: Electrons in covalent compounds are shared between the two atoms, unlike the case in what type of bonds?    Choices:  - horizontal bonds  - weak bonds  - soluble bonds  - ionic bonds  A:
(A).
ionic bonds


(Q).
Q: We divide up the earth's seas into five what, which are really all interconnected?    Choices:  - lakes  - continents  - ecosystems  - oceans  A:
(A).
oceans


(Q).
Q: The period immediately following the transmission of an impulse in a nerve or muscle, in which a neuron or muscle cell regains its ability to transmit another impulse, is called the ______ period.    Choices:  - activation  - extraction  - interstitial  - refractory  A:
(A).
