Stack #872814 Word Scramble

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Question	Answer
in all animals except sponges, the zygote undergoes cell division that forms a(n) ________, which eventually develops into three distinct layers of cells, which are e_________, m____________, and e_________.	blastula;ectoderm; mesoderm; endoderm.
all animals have their own particular ________ ________, a term used to describe an animal's shape, symmetry, and internal organization.	body plan.
sponges are _______.	asymmetrical.
the first animals to evolve in the ancient oceans had ________ _________, having the body parts are arranged around a central axis.	radial symmetry.
having distinct right and left halves is called ______ ________.	bilateral symmetry.
most animals with bilateral symmetry also have evolved and anterior concentration of sensory structures and nerves- a feature called _________.	cephalization.
bilateral symmetrical animals have different kinds of internal body plans depending on whether they have a(n) __________, a body cavity filled with fluid or not.	coelom.
animals with not body cavity are called _________.	acoelomates.
____________ have a body cavity located between the mesoderm and the endoderm.	psuedocoelomates.
___________ have a body cavity located entirely within the mesoderm, and the gut and other internal organs are suspended within a fluid-filled coelom.	coelomates.
scientists often use a type of branching diagram called a(n) ____________ _______________, which shows how animals are related through evolution.	phylogenetic tree.
Simple animals have a(n) ________ ________, which is a digestive system with only one opening.	gastrovascular cavity.
the uptake of oxygen and release of carbon dioxide are called ________ and can take place only across a wet surface, i.e. damp skin or an earthworm, the ______ or an aquatic animals, or the _____of a land animal.	respiration; gills; lungs.
in an _______ ________ ________, the heart pumps a fluid into the body and the fluid collects in open spaces in the animals boddy, and is returned to the heart.	open circulatory system.
in a(n) ______ ________ _______, the heart pumps blood through a system of blood vessels; the blood remains in the blood vessesl and materials pass into and out of the blood vessels through diffusion.	closed circulatory system.
an animal's _______skeleton provides a framework that supports its body and helps protect its soft parts.	skeleton
Earthworms have a(n) ________ ________, which consists of water that is contained under pressure in a coelom.	hydrostatic skeleton
insects, clams, and crabs have a(n) _______, which is a hard external skeleton that encases the body of the animal.	exoskeleton
a(n) __________ is composed of hard material, such as bone, and is embedded within an animal.	endoskeleton
many simple invertebrates produce both types of gametes because they have both testes and ovaries; such animals are called __________.	hermaphrodites.
most aquatic animals release the male and female gametes near one another in the water, where fertilization occurs; this is called ______________ ____________.	external fertilization.
in _________ _________, the union of the sperm and egg occurs within the female's body.	internal fertilization.

Created by: AKD