This period is generally divided into three: germinal, embryonic, and fetal.

• common ancestry
• egg
• embryonic stages
• development

A change in the inherited characteristics of an organism over time is ________

• evolution.
• development.
• growth.
• ancestry.

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A group of cold-blooded animals which lay eggs and have skins covered with small hard plates called scales, are___________

• reptiles.
• mammals.
• birds.
• armadillos.

Any of various warm-blooded vertebrate animals characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young are called_________

• mammals.
• reptiles.
• birds.
• penguins.

Another word for specific parts that form an organ, system, or living thing is __________.

• structure.
• vertebrae.
• forelimb.
• organism.

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_____________  is the study of embryos to see how their similarities and differences indicate an evolutionary relationship.

• Paleontology
• Common ancestry
• Homologous structure
• Embryology

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An organic vessel where an embryo develops is called _____________

• an egg.
• a common ancestor.
• the tree of life.
• an embryonic stage.

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The series of changes which animal and vegetable organisms undergo in their passage from the embryonic state to maturity, from a lower to a higher state of organization is called ___________

• embryonic stage.
• common ancestry.
• development.
• growth.

The most recent ancestral form or species from which two different species evolved is known as ________________________.

• a common ancestor.
• an embryonic stage.
• development.
• evolution.

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Common ancestry relates to evolution because

• evolution only happens when there are common ancestors.
• Common ancestors make evolution happen more quickly.
• evolution can never take place with common ancestors.
• the more two organisms have in common, the more recent is their common ancestor during their evolution.

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