USGS
Geologic Time |
G
protein-coupled receptor |
Homeodomain
protein bound to DNA |
Estrogen
bound to estrogen receptor protein |
Darwin's
Galápagos Finches |
Painting
of HMS Beagle |
Megaceras
by Joseph Smit (1836-1929)
from Nebula to Man
1905 England |
Woolly
Mammoth
by unknown
from St. Nicholas Magazine
1882 United States |
Moa
Bird
by Joseph Smit (1836-1929)
from Extinct Monsters
1892 England |
Oreodont
Oligocene Early Mammal |
Mesohippus
Early Horse |
|