Answer:
19.2 meters/second^2 would be the correct answer.
Explanation:
 
        
             
        
        
        
The leg curl exercise focuses on three areas of your body: at the back of your thighs, the thing part nearest to your knee and the calves. The muscles involve in these areas are the hamstrings, quads and calf muscles, respectively.
        
             
        
        
        
Answer:
1A - Respiratory = trachea, lungs... however both arteries and veins move oxygen around the body, and are therefore valid answers
1B - Skeletal = bones 
1C - Muscular = muscles
1D - Digestive = stomach, large/small intestine
1E - Circulatory = heart, veins and arteries 
2. Cellular respiration is the conversion of sugar into energy the cell uses to function via various chemical reactions. Digestion is an example of this. Stomach acid breaks down food into sugars that cells break down further into energy to keep you alive
3. Bones contain bone marrow deep inside of them which is responsible for the creation of red blood cells. Your lungs can move air all they want but would be useless without red blood cells to take the oxygen to cells and take the CO2 away from them. 
 
        
             
        
        
        
Density. Density is the measurement of how much matter is in a substance
 
        
             
        
        
        
Answer:
Lactose intolerance is when your body can't break down or digest lactose. Lactose is a sugar found in milk and milk products. Lactose intolerance happens when your small intestine does not make enough of a digestive enzyme called lactase. Lactase breaks down the lactose in food so your body can absorb it.
Explanation: