What is the Half Life of this isotope? 100
280
60
Sample remaining (5)
40
20
0
15
20
10
Time (days)
OB. 5 days
OD. 3 days
O C. 10 days
O A. 8 days

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !

Which polymers are most closely related? a. protein and nucleic acids b. cellulose and starch c. nucleic acids and starch d. nucleic acids and cellulose

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus