Exam 17: The Evolution of Animals

Which group of fishes includes a lineage that migrated out of fresh water and adapted to life on land?

________ are the mammalian group that lays eggs.

Swim bladders ________.

Insects, such as the grasshopper in the image, have ________.

Placental mammals are called ________.

What is a way in which scientists can test hypotheses about events that occurred in the distant past?

Sponges are examples of ________.

A characteristic that is shared by snakes and birds is ________.

What type of symmetry does this organism exhibit?

All but one of these reasons indicate why humans have successfully colonized almost every major habitat on Earth. Choose the EXCEPTION.

A feature unique to mammals includes ________.

What does the term "tetrapod" mean?

What would be an appropriate method to use if scientists wanted to determine how mutations of Human Immunodeficiency Viruses (HIVs)have changed over time from a common ancestor?

Which human characteristic was hypothesized to have evolved first but was later found NOT to have evolved first?

-The phylogenetic tree indicates that flatworms are similar to cnidarians in that both ________.

A feature that freed reptiles from dependence on water for reproduction is ________.

Which characteristic is common to all chordates?

You are given the task of confirming the categorization of a newly discovered marine animal that has been tagged as a species of echinoderm. What evidence would convince you that it is an echinoderm and not different marine animal such as a sponge or sea anemone?

Which animals have a cylindrical body that is tapered at both ends?

Scenario Several studies involving molecular analyses of Comb jellies, also known as sea gooseberries, cast doubt on the theory that sponges are the oldest animal phylum. Reported results of the studies suggested that Comb jellies, more complex animals having muscles and a nervous system, may actually be the true, first phylum of animals that diverged from a metazoan common ancestor. However, in 2015, a team of scientists re-analyzed the genetic data in the Comb jellies research with more specialized methods, and they determined that sponges were indeed the oldest animal phylum. -If Comb jellies were actually found to be the oldest animal phylum, how would this information impact our current understanding of the evolution of organisms?