Scientific Illustration

bioguru:

Photomicrograph of human scalp (top) and thick skin (bottom), showing the layers of the epidermis, the dermis, the subcutaneous layer (hypodermis), hair shafts, hair follicles, adipose tissue, blood vessels, arrector pili, and sebaceous glands. Can you identify them all?

1, 2, 3, 4

elegantbuffalo:

Lystrosaurus murrayi—one of the many fossils that supports the Theory of Continental Drift/Plate Tectonics.

Alfred Wegner first proposed this idea by noting that the rock sequences in South America, Africa, India, and Australia are almost identical, and thereby must contain similar fossils.