Exam 13: Evidence of Evolution

Figuer: -Fossil evidence shows that Tiktaalik had both lungs and gills,indicating that it could

The half life of ¹⁴C is 5,730 years.11,460 years after an organism dies,what percent of the initial ¹⁴C will still be present in the organism's bones?

The abundant remains of ammonites in Oklahoma indicate that Oklahoma was

Relative dating uses ______ to estimate how old a fossil is.

In the geologic timescale used by our author,the sequence of eons and eras beginning with the earliest era and proceeding forward to the most recent era is

The discovery of the fossilized remains of Archaeopteryx in 1860 led to the beginning of the hypothesis of birds being closely related to

Some dinosaurs and birds share characteristics that make flight possible such as

According to fossil evidence,Tiktaalik either crawled or paddled in shallow,tropical streams,approximately 380 mya.These streams may have occasionally become anaerobic,but fossil structures in Tiktaalik indicate it could have what adaptation or selective advantage in these conditions?

According to Plate Tectonics Theory,Earth once consisted of a single,large landmass named

The large geologic time period which includes eons that predate life on Earth,and also include eons in which the earliest life on Earth began is the

Amphibians,birds,and mammals look the most similar as

When ocean levels dropped about 70 million years ago,marsupial mammals moved into North America and displaced many of the placental mammal species.

The abundant presence of ammonite fossils,corals,sponges,and crinoids in a large area indicate that the area was once part of an ocean.

Which of the following is least likely to be preserved as a fossil?

The name of the specialized field of studies that examines fossils and other clues to past life or environmental conditions is

Figuer: -A phylogenetic tree is shown in part (b)of the image above.Phylogenetic trees visually represent hypotheses of the evolutionary relationships and ancestry of species or species groups.In this case,Najash is placed in proposed context with other snake species,representing different groups of snakes around the world.What can you conclude about the evolution of sea snakes and the Najash species?

The fossil record is often incomplete,in part because scientists will never be able to discover some of the fossils that are buried deep in the earth.

The observation that most aquatic vertebrates (e.g.fish,penguins,and whales)have streamlined bodies and fins or flippers for steering are a result of

Dinosaurs devoloped,became diverse and eventually became extinct during the Paleozoic era.

Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of survival.This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed between the two continents.