The common sand dollar or flat sea urchin. Upper surface with the spines partly removed.
A modern crinoid showing steam with root or hold-fast attachment, and a crown composed of the calyx…
Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system. Neither…
Illustration of an xy grid/graph with grid lines shown. It is the Cartesian coordinate system with both…
Estheria californica is a species of Branchiopod crustaceans most closely resembling the shrimp.
The Milkweed Tiger Moth (Euchaetes egle) is an insect in the Arctiidae family of tiger moths.
The larva Milkweed Tiger Moth (Euchaetes egle) is also known as the Milkweed Tussock caterpillar.
A flowering branch of the Blue Gum Tree (Eucalyptus globulus), a tree in the Myrtaceae family of evergreen…
"A pelagic family of radioflagellate infusorians, typified by the genus Euchitonia. The animalcules…
The Southern Rockhopper Penguin (Eudyptes chrysocome) is a bird in the Spheniscidae family of penguins.
Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…
Illustration used to show how to draw a perpendicular to a straight line from a given point on the line…
Illustration used to show how to draw a perpendicular to a straight line from a given point that is…
Illustration used to show how to draw a perpendicular to a straight line from a given point that is…
Illustration used to show how to draw a straight line parallel to a straight line through a given point.
Illustration used to show how to construct a bisector of an angle when the sides intersect within the…
Illustration used to show how to construct a bisector of an angle when the sides no not intersect within…
Illustration used to show how to divide a given straight line into required number of equal parts.
Illustration used to show how to divide a given straight line into required number of equal parts.