Science Process Skills: Teaching Students to Compare and Contrast
Comparing and contrasting in science is an essential science process skill that helps students analyze observations and understand relationships between organisms, data, and structures. Scientists use compare and contrast skills to identify patterns, classify organisms, and draw meaningful conclusions.
In science, to compare means to identify similarities between two or more objects or organisms, while to contrast means to identify their differences. Learning how to compare and contrast in science helps students organize information, evaluate evidence, and think more critically about what they observe.
Students who develop strong compare and contrast skills become better scientific thinkers. They learn how to recognize patterns, ask deeper questions, and support their conclusions using evidence.
Teachers often use compare and contrast activities at the beginning of the school year when introducing science process skills and scientific thinking. If you are looking for a ready to use compare and contrast science activity for teaching science process skills, you can view my complete lesson here.
What Does It Mean to Compare and Contrast in Science?
When scientists compare two things, they look for the ways those things are similar. When they contrast two things, they look for the ways they are different.
Scientists use comparison in many situations, including:
• comparing two organisms to understand evolutionary relationships
• comparing the data from repeated experiments to check for consistency
• comparing experimental results to identify patterns or trends
• comparing structures in organisms to determine how they function
• comparing characteristics to classify organisms into groups
For example, when scientists compare a shark and a dolphin, they may initially notice that both animals have streamlined bodies and live in the ocean. However, careful comparison reveals important differences that help scientists classify these organisms correctly.
The shark is a fish that breathes through gills, while the dolphin is a mammal that breathes air through lungs. This important difference shows that these two organisms are only distantly related. Even though they are not closely related, both the shark and the dolphin have evolved streamlined bodies that allow them to move efficiently through water. Observing similarities and differences like these helps scientists understand how organisms are related and how they have adapted to their environments.
Teaching students to analyze similarities and differences helps them develop critical thinking and observation skills that are essential throughout biology and other science classes.
Teaching the Science Process Skill of Comparing and Contrasting
Many students struggle with comparing and contrasting because they focus only on obvious differences. Effective science instruction helps students develop the ability to observe carefully and identify meaningful similarities and differences.
One way to teach this skill is to present students with images or examples of organisms and ask them to analyze how the organisms are alike and how they are different.
Students can then use their observations to answer deeper questions such as:
• Why are these similarities important?
• Why do these differences exist?
• What conclusions can be drawn from these observations?
This type of activity helps students begin thinking like scientists.
Science Process Skills Activity: Compare and Contrast
To help students practice this important science skill, I created a lesson designed specifically to teach students how to compare and contrast scientific observations.
This activity includes an instructional presentation and student practice worksheets that guide students through the process of analyzing similarities and differences.
Instructional PowerPoint and Google Slides
The lesson begins with a short PowerPoint or Google Slides presentation that introduces the skill of comparing and contrasting.
During the presentation, students examine images of organisms and practice identifying their similarities and differences. These examples help students understand how scientists analyze observations and draw conclusions.
The slides guide students through questions that encourage deeper thinking about the importance of the similarities and differences they observe.
Printable and Editable Student Worksheets
After the instructional slides, students complete a five page worksheet that provides repeated practice with comparing and contrasting.
The worksheet includes a variety of question types that require students to:
• analyze similarities and differences
• examine biological structures
• evaluate observations
• draw conclusions based on evidence
These activities help students develop stronger observation and reasoning skills, which are essential components of scientific thinking.
Digital Versions for Google Slides and Google Forms
Both printable and digital versions of this activity are included.
Teachers can choose to use the worksheets in traditional printed format or assign the digital versions through platforms such as:
• Google Classroom
• Google Slides
• Google Forms
• Microsoft OneDrive
This flexibility makes the activity easy to use in traditional classrooms, 1:1 classrooms, or distance learning environments.
When Can This Lesson Be Used?
This lesson works well at several different points during the school year.
Many teachers use this activity at the beginning of the year to help students begin thinking like scientists and developing important science skills.
The activity also works well when teaching units on:
• classification and taxonomy
• evolution
• scientific observation
• science process skills
Because the activity focuses on observation and reasoning, it can be used in many different science contexts.
Science Process Skills Resource
If you are interested in using this activity with your students, you can view the complete resource here:
Science Process Skills: Compare and Contrast Activity
This resource includes:
• PowerPoint and Google Slides presentation
• five page printable student worksheet
• digital Google Slides student worksheet
• editable Google Forms version
• teacher guide and answer key
More Science Skills Activities
If you are looking for additional activities to help students develop important science skills, you may also be interested in these related resources.
👉 “If you want a full overview of teaching science skills, read this post on essential science skills.
