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Phylum of organisms with exoskeleton made of chitin and jointed appendages like spiders, centipedes and insects
eukaryotic no, cell walls
List four characteristics all animals have in common.
During embryonic development, the hollow ball of cells of an embryo is called a ________________.
What germ layer in an animal embryo gives rise to muscles, circulatory, reproductive and excretory systems?
Terrestrial invertebrates use mantle cavities, tracheal tubes and ________ as respiratory structures
Many insects like butterflies convert ammonia waste to uric acid in their _____________.
Fresh water flat worms like planarians use __________ to remove excess water from body fluids.
_____________ undergo internal fertilization when sperm is taken into the body from the surrounding water.
The inner layer of germ cells that make the gastro-intestinal tract and respiratory system.
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