1. The graph below shows the winter precipitation in Arizona from 1995 to 2002. It also shows the survival rates of Arizona pronghorn fawns for
the same period.
Precipitation and Arizona
Pronghorn Fawn Survival
90
90
80
80
70
70
60
-
60
50
50
Precipitation (cm)
Fawns/100 Females
40
40
30
30
20
20
10
10
0
→
1995 1996 1997 1998 1999 2000 2001 2002

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.