Onion Cells
Onion cells are often used in biology classes as an introduction to microscopy. Important cell structures such as the cell
3D-Model
Spirogyra
A common, almost always found representative in the domestic lakes, ponds and slow-flowing streams and rivers is spirogyra alga (also
Bruchrechenset – Fraction Circles
Dieses Bruchset eignet sich gut für die Einführung in die Bruchrechnung. Die einzelnen Elemente sind ineinander stapelbar, sodass ein unmittelbarer