Suppose That a Lifeform Was Discovered on Mars,and All of the Different

question 19

Multiple Choice

Suppose that a lifeform was discovered on Mars,and all of the different individuals in this lifeform had exactly the same genetic material.Why would biologists find this surprising?

• A)Mars has never had conditions suitable for life.
• B)Lifeforms on other planets are not expected to have genetic material.
• C)Mars has had varying environmental conditions through its history.
• D)Random variations in genetic material are expected to help lifeforms adapt.

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Definitions:

Bilateral Animals

Organisms with a symmetrical body plan, dividing the body into two equal halves, characteristic of most animals.

Proboscis

An elongated appendage from the head of an animal, especially an insect, used for feeding or sensing.

Deuterostomes

A major group within the animal kingdom that includes organisms developing an anus from the first opening in the embryo, with subsequent formation of the mouth.

Protostomes

A group of animals characterized by developing the mouth before the anus during embryonic development, including mollusks and arthropods.