Why was the Mesozoic era extinction significant to the history of mammals? a. As photosynthesis slowed, meat-eating mammals prevailed. b. Fewer plankton species meant more open ocean ecosystems for large, aquatic mammals. c. Dinosaur extinctions opened up new habitats to mammals. d. Only the smartest primates knew how to survive the extinction.

Cephalopods have complex eyes that arose separately from vertebrate eyes that are also used in vision. What's this an illustration of? A. Analogous structures B. Vestigial structures C. Homologous structures D. Missing links

According to " Denisovans: Decoding the Secrets of Our Mysterious Ancient Cousins”, what kinds of tool artifacts were found in the cave near Denisovan specimens?    A.Lithic cores B.Levallois cores C.Oldowan Choppers D.Both A and B E.Both A and C

Which mechanism of fossil formation created a replica of an organism's original form? a natural cast b amber-preserved c permineralization d trace fossil

According to "The Life and Death of a Neanderthal (Shanidar 1)”, what finally killed Nandy?    A.He lost his leg in battle B.A cave-in C.A spear to the back D.A tooth infection

Fossil insects many times larger than any insects alive today have been dated to the Carboniferous and Permian periods. These fossils are evidence that during these periods a. the climate was much warmer than it is today. b. the oxygen concentration of the atmosphere was significantly higher than it is today. c. the carbon dioxide concentration of the atmosphere was lower than it is today. d. insects had fewer competitors for food than modern insects. e. there were fewer predators on insects than there are today.

According to "Homo erectus – The First Humans”, what stone tool is believed to be developed by Homo erectus?   A.Oldowan Chopper B.Levallois Flake C.Acheulean Hand Axe D.Levallois Fishing Rod