A Lumen Is a Cavity Within a Hollow Organ or Tube

question 24

True/False

A lumen is a cavity within a hollow organ or tube.

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Definitions:

Genetic Imprinting

An occurrence in genetics where the expression of certain genes depends on whether they come from the mother or the father.

Dominance Hierarchy

A linear “pecking order” into which animals in a population may organize according to status; regulates aggressive behavior within the population.

Sexual Selection

A mode of natural selection where members of one biological sex choose mates of the other sex to mate with, and compete with members of the same sex for access to members of the opposite sex.

Reproductive Isolating

Biological barriers that prevent different species from mating and producing fertile offspring, maintaining species boundaries.