A group of students wants to find out how friction affects the motion of a toy car traveling down a ramp. ​
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​Which set of ramps will best help the students in their investigation?
A
wooden ramps that are different heights
B
plastic ramps that are different lengths
C
ramps that are identical except for their surfaces
D
ramps that have identical surfaces but have different lengths and heights

Drag each label to the correct location on the image. each label can be used more than once. a scientist introduced mutations in a gene sequence isolated from bacteria. study the sequence, and identify the steps where the mutations may affect the formation of proteins. in the sequence, black letters stand for protein coding regions and red letters stand for noncoding regions. protein will not be changed. protein may be changed. attcgtgttc atcgtgttc atcgtattc attcgtattc

The tubes transporting minerals and water upward are called ?

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.