The correct answer would be the second option. The correct plan for his experiment would be that the temperature, the type of limestone, and the type of acid are controls. The amount of acid and the amount of damage to the limestone are variables. To determine the degree of damage of the acid it would be best that the amount of acid is the manipulated variable while everything else are assumed constant.
<em>Part </em><em>A</em>
<em>5.4-3.1=2.3 - time </em><em>David</em>
<em>Part </em><em>B</em>
<em>4</em><em>,</em><em>9</em><em>+</em><em>3</em><em>.</em><em>1</em><em>=</em><em>8</em><em> </em><em>-</em><em> </em><em>time </em><em>T</em><em>ed</em>
<em>Part </em><em>C</em>
<em>So</em><em> </em><em>answers</em><em>:</em><em> </em>
<em>1</em><em>.</em><em> </em><em>2</em><em>.</em><em>3</em>
<em>2</em><em>. </em><em>8</em>
You're welcome amigo
Answer:
well according to dora u need a map to find where to go and the map is your best friend
Explanation:
some of the Incas used camels/lamas to transport the trade across their dirt road is you look on google maps you can see their roads
