Listed below are the Disciplinary Core Ideas (DCI) for Life Science and bullet points for their specific grade band progression.
LS4.A: Evidence of Common Ancestry and Diversity
- Some kinds of plants and animals that once lived on Earth are no longer found anywhere.
- Fossils provide evidence about the types of organisms that lived long ago and also about the nature of their environments.
- The collection of fossils and their placement in chronological order (e.g., through the location of the sedimentary layers in which they are found or through radioactive dating) 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, enable the reconstruction of evolutionary history and the inference of lines of evolutionary descent.
- Comparison of the embryological development of different species also reveals similarities that show relationships not evident in the fully-formed anatomy.
- Genetic information provides evidence of evolution. DNA sequences vary among species, but there are many overlaps; in fact, the ongoing branching that produces multiple lines of descent can be inferred by comparing the DNA sequences of different organisms. Such information is also derivable from the similarities and differences in amino acid sequences and from anatomical and embryological evidence.
This is a table of the Disciplinary Core Ideas
of Life Science. If
coming from a Standard the specific bullet point used is highlighted
and additional performance Expectations that make use of the
Disciplinary Core Idea can be found below the table.
To see all Disciplinary Core Ideas, click on the title "Disciplinary Core Ideas."
Other Standards That Use This Disciplinary Core Idea: