Which of These Groups Is Characterized by a Lack of Symmetry

question 74

Multiple Choice

Which of these groups is characterized by a lack of symmetry (neither radial nor bilateral) ?

• A) Arthropods
• B) Sponges
• C) Cnidarians
• D) Flatworms
• E) Chordates

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Definitions:

Kidney

An organ in vertebrates that is essential for the filtration and excretion of waste products from the blood and the regulation of bodily fluids.

Adrenal Medulla

The inner region of each adrenal gland; secretes epinephrine and norepinephrine.

Fight-or-Flight Response

A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.

Sodium Excretion

The process by which the kidneys remove excess sodium ions from the body to maintain fluid and electrolyte balance.