Although Several Invertebrate Groups Have Been Proposed as Chordate Ancestors,most

question 32

Multiple Choice

Although several invertebrate groups have been proposed as chordate ancestors,most zoologists now believe the embryological evidence indicates the chordates have probably descended from ancestors nearest the ___________ lineage.

• A)Arthropoda
• B)Cnidaria
• C)Annelida-Mollusca
• D)Lophophorate
• E)Echinodermata

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Definitions:

Convergent Evolution

The phenomenon where unrelated species develop alike characteristics independently due to the need to adjust to comparable environments or ecological niches.

Sexual Selection

A mode of natural selection where individuals with certain inherited characteristics are more likely than others to obtain mates.

Visible Weaponry

The overt display of weapons or items intended for use in aggression or defense, readily apparent in a social or interpersonal context.

Embryos

Embryos are the early developmental stages of multicellular organisms following fertilization, before becoming fetuses.