The Oklahoma Academic Standards for Science (OAS-S) are three-dimensional performance expectations representing the things students should know, understand, and be able to do to be proficient in science and engineering. Performance expectations are considered standards and include a science and engineering practice (indicated in blue and represent everyday skills of scientists and engineers), disciplinary core ideas (represented in orange and represent science ideas used by scientists and engineers), and a crosscutting concept (indicated in green and represent ways of thinking like scientists and engineers).
Each dimension in the OAS-S grows in complexity and sophistication across the grades. To learn more about the prior knowledge and skills students have developed (or future knowledge/skills) associated with that specific dimension, each section in the standard below is hyperlinked to that specific vertical learning progression page.
8.LS4.2 Biological Unity and Diversity
|
8.LS4.2 Apply scientific ideas to construct an explanation for the patterns of anatomical similarities and differences among modern organisms and between modern and fossil organisms to infer ancestral relationships.
|
|
Clarification Statement: Emphasis is on explanations of the ancestral relationships among organisms in terms of similarities or differences of anatomical features or structures. Examples could include how structural similarities/differences could determine relationships between two modern organisms (i.e. wings of birds vs. bats vs. insects) or modern and fossil organisms (i.e. fossilized horses compared to modern horses, trilobites compared to horseshoe crabs).
|
|
Assessment Boundary: Assessment does not include the names of individual species or geological eras in the fossil record.
|
Science and Engineering Practices
|
Disciplinary Core Ideas
|
Crosscutting Concepts
|
|
Constructing Explanations
|
Evidence of Common Ancestry and Diversity
-
The collection of fossils and their placement in chronological order (e.g., through the location of the sedimentary layers in which they are found) is known as the fossil record. It documents the existence, diversity, extinction, and change of many life forms throughout the history of life on Earth.
-
Anatomical similarities and differences between various organisms living today and between them and organisms in the fossil record serve as evidence of ancestral relationships among organisms and changes in populations over time.
|
Patterns
|
|
Connections to other Performance Expectations in Grade 8 Science
|
|
Evidence of Ancestral Relationships
|
Navigation Links
Grade 8 Science Home Page
Grade 8 Science Standards and Bundle Analyses
3D Science Vertical Learning Progressions
OKScience Frameworks Introduction
Comments (0)
You don't have permission to comment on this page.