What acts as both a circulatory system for gas exchange and a hydraulic system for movement in the echinoderms?
Some organisms are described as having a ________ digestive tract that includes a mouth at one end and an anus at the other.

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Which of the following unique characteristics is found in many chordates, but not all, at some point in their development?
No, the trait arose independently in several lineages after the development of limbs in the terrestrial tetrapods.
There are several limbless amphibians and reptiles. Did these limbless creatures evolve from a common limbless ancestor?
Imagine you were able to travel back in time to any place you wanted to witness the evolution of humans. Answer the following question related to your journeys.If you were to travel back in time and met a living hominin, which clues might tell you that your new friend was in the genus Australopithecus and not Homo?
Imagine you were able to travel back in time to any place you wanted to witness the evolution of humans. Answer the following question related to your journeys.At any point in your time travels, did you see two or more hominin species alive at the same time and in the same places?
Imagine you were able to travel back in time to any place you wanted to witness the evolution of humans. Answer the following question related to your journeys.On which continent would you have seen the very earliest members of Homo sapiens?
One key adaptation of animals of a(n) _____________, a fluid-filled gap between the outer wall of the body and the outer wall of the digestive system.
All animals are___________,organisms with cells that are relatively large, complex, and contain membrane-enclosed organelles such as the nucleus.
Cnidarians are the only animal phylum to display _______________, meaning that their bodies can be divided anyway through the center point to yield two even halves. All other adult animals display ______________,meaning that their bodies can only be sliced lengthwise through the midline to produce two even halves.
All animals except sponges have ___________, groups of cells that work together to perform a specific function.
All animals eat other organisms in order to gain building materials for the body. This makes them ___________, since they obtain necessary energy & chemical building blocks from the environment.
A(n) __________is an animal that has a backbone in addition to displaying the four features of all chordates.
The phylum ------- contains animals that share four specific anatomical features, including a hollow nerve cord and a tail.
One of the features shared by all chordates is a(n) ___________,a flexible rod that runs along the top side of the back.
A(n) ________is an animal that lacks a backbone in addition to displaying the four features of all chordates.
Adaptations that evolved in the group of animals called the _________ have allowed them to complete their life.

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A group of animals called ________ have several adaptations for living on land but must return to the water breed.
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