What is the difference between stem cells and progenitor cells?
A) There is no difference, they are two different names for the same cells.
B) Stem cells can form any type of cells, but progenitor cells cannot.
C) Stem cells can only form more stem cells, but progenitor cells can form many types of cells.
D) Stem cells can form any type of cells, but progenitor cells can only form a few types of cells.
A
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Evidence for free oxygen in the atmosphere comes from ____
a. zircon crystals b. sandstone-carbonate-shale assemblage c. multicelled organisms d. continental red beds e. tillites
The earliest fish had
a. plated skin. d. lungs. b. jaws. e. ray-fins. c. spiny skin.
Which of the following is NOT a measure of water vapor in the atmosphere?
A) Dew point B) Absolute humidity C) Specific humidity D) Potential evapotranspiration E) Relative humidity
The National Environmental Policy Act (NEPA)
A. Provided for the distribution of authority for environmental policy among 15 different federal agencies B. Was passed in 1899 as a national policy to dump so much garbage that navigation was blocked in rivers C. Was the first congressional recognition of the need for a national policy for a clean environment and it provided for the distribution of authority for environmental policy among 15 different federal agencies D. Was the first congressional recognition of the need for a national policy for a clean environment E. Regulates the way in which pesticides are developed and used