What do we refer to when we separate things into groups based on their common characteristics?

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Tinas calculations of the tarantula found that the spider was able to cover 20 centimeters in 5 seconds what was the average speed of the spider whats the answer, speed, distance and time