Use the drop-down menu to complete the sentence.
animal herders in the sahara adapted to their environment by a. moving to cities to find work b. living a nomadic lifestyle
c. moving their herds south of the sahel
d. irrigating rivers to create more farmland

Animal herders in the Sahara adapted to their environment by living a nomadic lifestyle.

The correct answer is B.

Explanation:

The animal herders will let their flocks graze in one place for a minimal amount of time. After the flock has eaten, they will move on to another place for fresh food. The herders live in the dessert, so they wear long loose robes to help keep the heat off their bodies. The herders know all of the natural landmarks and find their way around, in the dessert,using the landmarks.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.