<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation
Our Terms of Use (click here to view) have changed. By continuing to use this site, you are agreeing to our new Terms of Use.
Concept Map

Invertebrates loading

Introduces animals without a backbone.

Concept Map

Explore connections in math and science

Find other related concepts
Discover related concepts in Math and Science.
Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Real World Application
    Horseshoe Crabs and Red Knots

    Horseshoe Crabs and Red Knots

    by Rachel Kurkowski //at grade

    Looks at the relationship between horseshoe crab spawning and Red Knots’ annual migration. Investigates how horseshoe crabs affect Red Knot survival, reasons for declines in horseshoe crabs and seasonal patterns of behavior.

Please wait...
Please wait...