These deep-sea holothurians (sea cucumbers) and brittlestars obtain food by
1.eating prey that swim past.
2.eating mud and digesting the bacteria and organic matter in it.
3.migrating vertically to the euphotic zone each night.
4.autotrophic means – they photosynthesize.
2
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The troposphere is warmed mostly by
A) short-wave radiation. B) long-wave radiation. C) solar radiation. D) clouds.
The Healthy Forests Restoration Act ________ national forest land
A) was passed in 1976 with the intent to ensure multiple use and sustainable yield of B) was passed to set up the formation of land trusts on C) restricts the use of snowmobiles on D) directs timber companies to remove small trees, underbrush, and dead trees to reduce fire threat E) offers subsidies to timber companies if they replant areas in
The most famous of the ice-dam failure floods is preserved in the "channeled scablands" topography in ________.
A. Manitoba B. Washington State C. Saskatchewan D. Iowa E. Alberta
Which of the following chapters in geologic time occurred before there were abundant animals with hard parts?
A. Paleozoic B. Mesozoic C. Precambrian D. Cenozoic