Sickle-Cell Anemia Is Found in Highest Frequencies in Populations From

question 25

Multiple Choice

Sickle-cell anemia is found in highest frequencies in populations from:

• A) western Africa
• B) central Arica
• C) southern Africa
• D) Scandinavia

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Definitions:

Poriferans

A phylum of aquatic invertebrate animals known as sponges, characterized by their porous bodies and lack of organized tissues and organs.

Suspension Feeders

Organisms that feed by filtering suspended particles and small organisms from water.

Autotrophs

Organisms that can produce their own food from inorganic substances using light (photoautotrophs) or chemical energy (chemoautotrophs).

Nematocysts

Specialized cells in the tentacles of cnidarians (such as jellyfish) that eject a stinging thread to capture prey or provide defense against predators.