The Closest Model for the Vertebrate Ancestral Stock Is Something

question 27

Short Answer

The closest model for the vertebrate ancestral stock is something similar to the _______ _______.

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Definitions:

Opiates

A class of drugs derived from opium, used to relieve pain but can also lead to dependency and addiction.

Pathogens

Microorganisms or agents, such as bacteria, viruses, fungi, or parasites, that cause disease in their host.

Proximodistal

A pattern of growth and development where development starts at the center of the body and moves towards the extremities.

Cephalocaudal

A principle of growth where development progresses from the head downward through the body.