Which of the following devices or techniques might be used to identify the presence of human remains? cadaver dogs ground penetrating radar aerial photographs all of the above may be used.

All of the above may be used.

Explanation:

Cadaver dogs: Cadaver dogs are the dogs which used to locate or detect the human remains from a region where they are expected to be found. This is due to the brilliant sensing ability of these dogs which helps the police department to find blood, placenta, partially degraded human remains buried in the soil.

Ground penetrating radar: The GPR system can be useful in detecting the buried remains inside the soil by using a radar system of landslide or avalanche victims.

Aerial photographs: The aerial photograph can be obtained from the entire suspected land any bones and entire skeleton can be identified or recovered by this approach.

On the basis of the above explanation all of the above may be used to identify the presence of human remains.

the sphincter muscles at the end of the digestive tract is the anus.