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specimens


samples, or examples used to represent a whole group

Cameron collected several plant specimens for his science project.

specimens

endurance


the ability to stay active or withstand stress for a long time

To build endurance, marathon runners train for several hours a day.

endurance

strenuous


requiring great energy or effort

Hiking along the rocky, steep mountain path was strenuous for even the most skilled hikers.

strenuous

replicas


exact copies of something

The original ships used by Vikings no longer exist, but some people have created replicas of them.

replicas

expedition


a journey with a specific purpose, such as exploring

In 1271, Italian explorer Marco Polo began a 24-year expedition that took him halfway around the world.

expedition
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