The process by which a fertilized egg becomes a distinct organism is called The process by which a fertilized egg becomes a distinct organism is called
A. epigenesis.
B. cellular dedifferentiation.
C. involution.
D. embryonic development.
E. metamorphosis.
D. embryonic development.
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In which group are retention of larval characteristics
and sexual maturity seen in the same body? a. toads b. salamanders c. frogs d. caecilians e. none of these
During the ingestion of food or liquid, which one of the following tips to block the opening to the trachea?
A) pharynx B) bronchi C) epiglottis D) bronchioles E) larynx
A male accessory organ of the reproductive system that often becomes enlarged, infected, or cancerous in older men is the
A. vas deferens. B. testis. C. prostate gland. D. epididymis. E. bulbourethral gland.
In order for allopatric speciation to occur, first there must be a geographic separation of two populations of the same species. The second step requires:
A) an increase in gene flow between the populations. B) additional extrinsic isolating mechanisms to become involved. C) physical and behavioral changes that keep them from interbreeding. D) physical and behavioral changes that permit occasional hybridization.