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animal evolution

Across
A type of development in which the second opening becomes the mouth
A type of symmetry in which right and left halves with similar parts, and a front and back that differ
Occurs when similar units are repeated along the length of the body
A sacklike gut or __________ cavity exists when food enters through the same opening that expels wastes, and the cavity also functions in gas exchange
A type of development in which the first openings that forms on an embryo becomes the mouth
Have a backbone
A _________ circulatory system is one in which blood never leaves blood vessels and exchange with cells takes place across vessel walls
Down
An _________ circulatory system is one in which the fluid leaves open-ended vessels and flows among tissues before returning to the heart
Do not have a backbone
A type of symmetry in which body parts are repeated around a central axis, like the spokes of a wheel
A tubular gut or a ________ digestive tract has parts of the tube that can be specialized for taking in food, digesting food, absorbing nutrients, or compacting waste