Members of the phylum porifera have all of the following characteristics except
specialized cell but no tissues
water flows through canals of the body
hollow body cavity for food
Oyster fishermen have trouble with sea stars (starfish) eating their oysters. They used to pick them up, chop the sea stars in half with a knife and return them to the ocean. Why was this not effective?
the internal organs of sea stars release chemicals that are toxic to shellfish, including oysters
sea stars do not actually eat oysters
sea stars can regenerate so each individual that was chopped in half became two new individuals
actually, it was quite effective and sea stars are not endangered
You have an unidentified animal that has radial symmetry, two laters of tissue and a hollow cavity to digest food. Therefore you are looking at a(n)
Which phylum fits the following characteristic? “three tissue layers, no body cavity”
Which phylum meets the following characteristic? “entrance and exit the same in the digetive tract”
Cnidaria and Platyhelminthes
Cnidaria and Arthropoda
Which of the following are not arachnids?
all of the above are arachnids
Which of the following structures are associated with arthropods?
all of the above