What did Joseph Connell find about barnacles?

Where the larger Balanus grew, it crowded out Chthamalus by growing over it, crushing it or prying it off the rock. Balanus could not live high on the shore because it dried out at low tide. Removing Balanus raised Chthamalus survival on the lower rocks.

How do you calculate percent taller?

Subtract the shorter height from the taller one, divide by the shorter height and multiply by 100. The root fungus sheet asks for this at week 12. Students show their work on the lines.

8th Grade Symbiosis and Predators Worksheets

Ages 13-14 · Free previews · Print-ready PDFs

Written by Adi Ackerman, Head Teacher

Living things interact in patterns such as mutualism, where both partners gain, and competition, where they fight over the same space or food. There are 2 sheets for 8th grade here, each with an answer key. Root Fungus Partnership Growth Data graphs pine seedling heights with and without fungus, and Barnacle Competition on a Rocky Shore graphs data from Joseph Connell's study in Scotland. The sheets practice MS-LS2-2.

8th Grade Science Ecosystems Symbiosis and predators Clear All

Barnacle Competition on a Rocky Shore

Grade8th Grade

TopicEcosystems

Root Fungus Partnership Growth Data

Grade8th Grade

TopicEcosystems

More ecosystems worksheets

Explore all of our 8th grade ecosystems worksheets, covering populations and invasive species, food webs and matter cycles, symbiosis and predators, biomes and biodiversity.

Populations and invasive species Food webs and matter cycles Biomes and biodiversity

Frequently Asked Questions

Thin fungus threads grow into the roots and spread through the soil, gathering phosphorus and water the roots cannot reach. The plant feeds the fungus sugar in return. Because both gain, it is mutualism.

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