At the end of which geological time period did the Starfish become extinct?

Secondary contact after divergence rarely results in? A. creation of a hybrid zone B. formation of a new species C. the rapid decline of both populations D. extinction of one population

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

What was Oparin-Haldane hypothesis on the emergence of life on Earth?    A. The Earth's amino acids were derived from volcanic eruptions B. The Earth's amino acids were from a 4.5 billion years old meteorite C. Inorganic compounds created organic compounds spontaneously D. Inorganic compounds were results of lightning and UV radiation

Which fossil would be the oldest in a given strata and why?

Name 3 types of animals from the text that live In the giant kelp forests.

Name three types of animals that existed during the mesozoic era

The Mesozoic Era is referred to as the: * O Age of Ages O Age of Reptiles O Age of Arthropods Age of Fish and Amphibians O Age of Mammals O Other:

What years was the Eocene period? Did Euprimates appear during this time?

What extinction event occurred about 200 mya? What animal groups were most affected by this event?