The Fossil Record Indicates That the Earliest Known Ancestor of Horses

question 21

Multiple Choice

The fossil record indicates that the earliest known ancestor of horses has four toes.Modern horses have only one.Which of the following best explains why this occurred?

• A) Environmental pressures selected for four toes over one dominant central toe over millions of years.
• B) Over the course of a lifetime,ancestors would lose toes due to the stresses of prairie life,such as predation and injury.
• C) Because the ancestors did not use all of their toes,their offspring were born with fewer toes.
• D) Gradually,over the course of many generations,the four toes merged together to form a single toe.
• E) Offspring with genetic mutations resulting in fewer toes were more likely to survive and reproduce.

Examine the factors influencing variances and the strategic responses to these variances.

Understand the basic components and functions of information systems.

Differentiate between data, information, and knowledge.

Recognize the significance of context in interpreting data.

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Definitions:

Melanosomes

Organelles within cells responsible for synthesis, storage, and transport of melanin, the pigment that gives color to skin, hair, and eyes.

Melanin

The pigment that gives color to the skin, hair, and eyes, providing protection against UV radiation damage.

Subcutaneous Tissue

The layer of tissue directly under the skin, consisting of fat and connective tissues that insulate and protect the body.

Integumentary System

The organ system that protects the body from external damage, consisting of the skin and its appendages like hair, nails, and glands.