- Most are able to repond rapidly to external stimuli
Lack of tissues separates _______ from all other animals.
A body plan in which any plane along a central axis will divide the body into approximately mirror-image halves.
A body plan in which only a single plane through the central axis will divide the body into mirror-image halves.
A form of development in which the body cavity forms within space between body wall & digestive cavity: annelids, arthropods, molluscs. -Head develops first.
A form of development in which the body cavity forms as an outgrowth of digestive cavity: echinoderms, chordates. -Anus develops first.
_______are found in most marine and aquatic enviroments.
Sponges may reproduce asexually by________, in which the adult produces miniature versions of itself that drop off and assume an independent existence.
_______are well-armed predators. Have two basic body plans-polyp and medusa, distinctive tissues,Cnidocytes, Gastrovascular cavity, and are important to the coral reefs.
The polyp form of Cnidarians is seen....?
- In hydra, sea anemones, and the individual polyps within a coral.
The medusa form of Cnidarians is seen....?
- In the jellyfish, resmbles an inverted polyp.
________ have organs but lack respiratory and circulatory systems.
The bodies of _______ are divided into a series of similar repeatign segments.
Is advantageous for locomotion, because the body compartments are each contolled by seperate muscles and collectively are capable of more complex movement than could be achieved with only one set of muscles to control the whole body.
A __________ annelid projects brightly spiraling gills from a tube attached to rock. When the gills retract, the tube is covered by the trap door.
The ________ _________ swims by using paddles on each segment. The bristles on each paddle can deliver a fiery sting.
A ________ is a freshwater annelid with numerous segments. The sucker encircles its mouth, allowing it to attach to its prey.
Characteristics of most mollusks.....
- Most have shells
- Open circulation
- Gastropods are one-footed crawlers
*Gas exchange via skin or simple lung
______ are Marine predators, have closed circulatory systems, and have highly developed brains and sensory structures.
An ________ can crawl rapidly by using its eight suckered tentacles, and can alter its color and skin texture to blend with its surroundings.
A ______ moves entirely by contracting its mantle to generate jet propulsion, which pushes the animal backward through the water.
The chambered _______ secretes a shell with internal, gas-filled chambers that provide buoyancy. Has well-developed eyes and tentacles used to capture prey.
_______ are the dominant animals on earth. Their exoskeletons require molting, segmentation, Gas exchange - gills, tracheae, or book lungs, and have open circulatorty systems.
________ are the only flying invertebrates.
Most _________ are predatory meat eaters.
_________ have many legs.
Most _________ are aquatic.
An __________ allows precise movements and must be molted periodically.