None- intracellular digestion (Sponges) Gastrovascular Cavity- one opening (Cnia

Question

None- intracellular digestion (Sponges) Gastrovascular Cavity- one opening (Cniadaria and Flatworms) Complete digestive system (Nematoda through Chordata) what is likely the common ancestor of all animals? are more recently derived? Triploblastic organisms or diploblastic organisms? Circle one. What is the difference between protostomes and deut erostomes? Which 2 groups make up the bilaterians? What do they have in common? Sponges Filter feeders. Choanocytes use their flagella to create a current of water that flows Features: through the ostia (pores) into the spongocoel or atrium and out the main opening, the osculun As the water passes over the choanocytes, their sticky collar cells adhere food particles of plankton and other matter and then perform phagocytosis. Cellular level of o Intracellular digestion. Sponges reproduce sexually by producing sperm and eggs through meiosis or budding using mitosis. asexually by

Explanation / Answer

1. What is likely the common ancestor of all animals?

Simple sponges are the likely the common ancestors of all animals.

2. Which are more recently derived? Triploblastic or diploblastic animals?

The diploblastic animals which are having two embryonic layers such as Cnidarians which include Jellyfish, corals, sea pens etc. are recently derived . Soon after diploblastic, triploblastic animals with three germ layers are evolved which include chordata and mollusca.

3. What is the difference between protostomes and deuterostomes?

The difference between protostomes and deuterostomes is that in protostostomes, the blastospore is developed into the mouth whereas in deuterostomes, the blastospore is developed into the anal opening.

4. Which two groups make up the bilaterians? What do they have in common?

The protostomes and deuterostomes are the two groups which make up the bilaterians.

They both have bilateral symmetry. They are triploblastic i.e. three germ layers.

They both have complex skeletons that allow them to be highly mobile.

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