If Asked on an Exam to Give a Property Not

question 41

Multiple Choice

If asked on an exam to give a property not found in the echinoderms,which would you write on the exam?

• A) They exhibit cephalization.
• B) Adults exhibit radial symmetry.
• C) Larvae exhibit bilateral symmetry.
• D) They have a complete digestive tract.
• E) They have spiny skin.

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Definitions:

Zinc

A chemical element with the symbol Zn and atomic number 30; it is a slightly brittle metal at room temperature and has a variety of uses, from galvanization to dietary supplements.

Isotope

An isotope is a variant of a particular chemical element, which differs in neutron number, while retaining the same number of protons.

Neutrons

Subatomic particles found in the nucleus of an atom, having no electrical charge and a mass slightly greater than that of a proton.

Element

A pure chemical substance consisting of one type of atom, distinguished by its atomic number, which is the number of protons in its nucleus.