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question 18

Multiple Choice

Use the following to answer questions:
Match the item in each question with the correct alternative from the list below.
-nalorphine ___


Definitions:

Germ Layer

Each of the three layers of cells (ectoderm, mesoderm, and endoderm) that form during embryogenesis, which give rise to all tissues and organs of an organism.

Radial Cleavage

A type of embryonic development in which the cells divide parallel or perpendicular to the polar axis, resulting in a radially symmetrical embryo.

Echinoderms

A phylum of marine animals characterized by radial symmetry and a unique water vascular system, including starfish and sea urchins.

Amphibians

Cold-blooded vertebrates that can live both in water and on land, such as frogs, toads, salamanders, and newts.

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