Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that
A) arthropods evolved before vertebrates did.
B) extant terrestrial arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates.
C) ancestral arthropods must have been poorly adapted to aquatic life, and thus experienced a selective pressure to invade land.
D) vertebrates evolved from arthropods.
E) arthropods have had more time to coevolve with land plants than have vertebrates.
Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
Mars's average distance from the Sun is roughly 230 million km (1.5 AU) and its orbital period
Deciduous and permanent teeth. (A) The deciduous teeth, with the age of eruption given in months; (B
The cranium of early African H. erectus KNM-ER 3733 is nearly 1.8 million years old.
Review Cognitive Changes over the Adult Years