How New Species Form brings Grade 7 students into the science of speciation through real-world examples of biological evolution and biodiversity. Rather than treating evolution as a collection of definitions, this learning stations activity asks students to compare how geographic separation, reproductive barriers, environmental conditions, and inherited differences can contribute to the formation of new species.

Designed for middle school life science, this resource connects the unity and diversity of living things with the processes that cause populations to diverge over time. Students examine examples involving island colonization, diversification within lakes, and changes in chromosome number, building a clearer understanding of how speciation can occur through different biological pathways.

Explore Three Pathways to Speciation

The station cards give students opportunities to investigate and compare distinct processes involved in species formation. They consider how geographic isolation can separate populations, how reproductive barriers can limit successful reproduction between populations, and how inherited differences interact with environmental conditions. Comparing island, lake, and chromosome-related examples helps students recognize that biodiversity develops through more than one process.

As students move between cases, they practise explaining scientific relationships, identifying relevant factors, and comparing evidence from different examples. The focus is on connecting biological processes to real examples rather than simply memorizing terminology.

What Is Included?

• Station cards: Provide the case-study material students examine as they investigate different examples of speciation.
• Station recording sheet: Gives students a place to record information and comparisons as they rotate through the activity.
• Station wrap-up: Provides a concluding component for bringing together ideas from the station investigations.
• Answer Key PDF with Teacher Guide: Includes Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes to support instruction and review.

How to Use the Activity

Place the station cards around the classroom and organize students into small groups. Groups begin at different stations, read the case-study cards, and record their findings on their own recording sheets. After the allotted time, groups rotate until they have visited every station. Finish with a class discussion comparing the examples and asking students to explain how the conditions and biological mechanisms differ.

This format works for a middle school evolution lesson, a structured small-group investigation, or a review of how biological diversity develops. The recording sheet keeps student thinking organized, while the wrap-up and teacher guidance provide a basis for consolidating the main ideas.

NGSS and Middle School Life Science

The resource identifies NGSS MS-LS4-5 as its standard framework. It focuses on explaining how separation and reproductive barriers can contribute to new species and using real examples to compare processes associated with biodiversity. Teachers can use the station discussions to connect these ideas to the broader study of biological evolution, while checking that the specific classroom objectives match their planned interpretation of the standard.

For Grade 7 science teachers covering speciation and the unity and diversity of life, this resource combines case-based investigation, individual recording, and guided discussion in one classroom activity. Students encounter contrasting examples and have a clear structure for comparing how new species can form.