Oklahoma Science 3.LS4.2

Science3rd GradeBiological Unity and Diversity

The Standard

Use evidence to construct an explanation for how the variations in characteristics among individuals of the same species may provide advantages in surviving and reproducing.

Oklahoma Academic Standards for Science (2026)

Teacher's field guide

What This Standard Means

What Students Need to Do: Students compare traits that vary within one species, such as beetle color. They use evidence to explain how a trait could help some individuals survive and have young in a particular habitat.
What Mastery Looks Like: A student can point to counts showing that fewer green beetles were spotted on green leaves than brown beetles. They explain that hiding from birds may let more green beetles live long enough to have young.
Common Misconceptions: Students may think a helpful color works in every habitat, even when the background changes. They may also think beetles turn green when birds appear, rather than recognizing differences already present among beetles.
How to Assess It: Exit ticket: On green leaves, a bird spotted eight brown beetles and two green beetles from the same species. Which beetles are more likely to survive and have young, and what in the counts supports your answer?

Lesson moves

Ways to Teach It

Place five green and five brown paper beetles on green paper, let a partner spot them for ten seconds, then count each color found.
Ask partners to write two sentences using their beetle counts: which color hides on green leaves, and how could hiding affect offspring?
Deal light and dark moth cards from one species with pale and dark tree cards; pairs match moths to bark and explain their choices.
Show photos of white and brown domestic rabbits on snow; ask which might escape a fox and later have young.

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