You Are a Paleontologist Studying the Part of the Geologic

question 45

Multiple Choice

You are a paleontologist studying the part of the geologic timescale known as the Devonian.Based on your studies,which group of animals made its first appearance on land during this time?

• A)birds
• B)mammals
• C)reptiles
• D)fish
• E)amphibians

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Definitions:

Intracellular Mediator

Molecule produced within a cell that binds to a macromolecule, such as receptors or enzymes inside that cell, that regulates their activities; also called second messenger.

Target Tissue

Specific tissues or organs that are affected by specific hormones, drugs, or other signals within an organism, responding due to the presence of appropriate receptors.

Gonadotropin-releasing Hormone

A hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary.

Follicle-stimulating Hormone

A hormone secreted by the anterior pituitary gland that promotes the formation of ova or sperm.