1) When _____in arctic regions, the Aleuts construct igloos as temporary winter shelters.

2) Most substances contract when they freeze so that the density of a substance’s solid is _____of its liquid.

3) The mechanism by which brain cells store memories is _____clearly understood.

4) Desert animals _____a means of retaining moisture in such a hot, dry climate if they are to survive.

5) _____ all data into electronic pulses.

6) Robert S. Duncanson was considered a painter of the Hudson River school, _____on scenes of America’s untamed wilderness.

7) _____ their senses, many-celled animals perceive what is happening in their environment.

8) In central Georgia, archaeological evidence indicates that Native Americans first inhabited the area _____.

9) The large compound eyes of the dragonfly _____ to see moving objects almost eighteen feet away.

10) Using many symbols makes _____ to put a large amount of information on a single map.

11) From the archeologist’s perspective, understanding the past is vitally important and requires ______ of earlier cultures.

12) The Texas Legislature selected Vassar Miller _____ in 1982, and again in 1988.

13) The distinguishing feature of a fluid, in contrast to a solid, is the ease _____ .

14) Oxygen and nutrients reach the body’s tissues _____ from the blood through the capillary wall.

15) _____ important development of the Neolithic age was not in the manufacture of stone tools but in the production of food.