Organisms have many planes of symmetry along which they can be cut into equal halves.

Organisms that maintain a constant internal body temperature are said to be _________.

Middle tissue layer

Organisms that cannot be cut into equal halves are said to be _______.

Which of the following is NOT a characteristic of animals?

Which body system is responsible for TRANSPORTING oxygen, nutrients, and waste?

Into which body system do organs like nephridia, kidneys, and Malpighian tubules belong?

Which of the following correctly describes an INCOMPLETE digestive system?

Which of the following correctly describes a CLOSED circulatory system?

Which body system is responsible for EXCHANGING oxygen and carbon dioxide with the environment?

Which body system is responsible for coordinating responses to what an organism senses in its environment?

Which type of body support structure uses water pressure to maintain the shape of the organism?

Which body system ensures species survival by producing the cells needed to make an offspring?

Which type of body support structure consists of an internal network of cartilage or bone?

Which body system is responsible for ELIMINATING waste produced from cellular metabolism?

Which of the following structures is present in the bodies of VERTEBRATES but not invertebrates?

Which of the following terms refers to the centralization of neural tissue in a distinct head region?

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