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Middle School Biology Department: 6th Graders Investigate Stimulus and Response

October 12, 2022

Recently in science class, the sixth-grade students learned about how the ability to sense stimuli and respond to them is one of the characteristics of all living things. A stimulus refers to a change in the environment that causes an organism to respond. The response is the reaction to the change. Teachers organized a lab involving earthworms to help students further explore this topic. Earthworms are organisms with bilateral symmetry, and they can respond to their surroundings fairly quickly. Earthworms also serve an important role in our ecosystems. They are decomposers and can thus increase the nutrient content of soil and remove heavy metals.

During the experiment, students were expected to find out which environmental conditions best suits earthworms. They carried out the experiment on October 11th and took live earthworms and investigated how they reacted under a wet/dry environment, light/dark environment, the presence of alcohol, and the presence of a predator. After the experiment, students concluded that earthworms prefer an underground environment where it is moist and dark, with no alcohol or predators present.

Through this experiment, students gained a better understanding of earthworms and have realized earthworms’ important role in maintaining the environment. We hope they will further protect earthworms and the environment!

Written by Yoyo 6(2)

Supervised by Michael Martin

Pictures by RongZhang Hu

Edited by Serene Yang, Niall Keenan