Question

Question 17 (1 point) During gastrulation in Protostome animals, the first pore to open up becomes the: O mouth O anus O eyes lungs

Answer 1

Answer 17: During gastrulation in Protostome animals, the first pore to open up becomes the mouth.In protostomes, the blastopore develops into a mouth.

So correct option is (a). All other options are not correct according to the given description.

Answer 15: The common parasites Ascaris ,canine heartworm ,and Guineaworm all are examples of Nematodes. So correct option is (a). All other options are not correct. Cestodes include Taenia solium ,Taenia saginata etc. Annelids include Earthworm, Leeches,Lugworms, Polychaetes etc. Arthropods include crabs, spiders, scorpions, sea spiders,millipedes, centipedes etc.

Answer 14: In coelomates, the coelom develops within the mesoderm.The coelom is formed during the stage of embryonic development. All other options are not correct.In coelomates coelom does not develops within the Ectoderm ,endoderm and blastoderm.

So correct option is (b).

Answer 8: it seems likely that the common ancestor of all animals was protist.So correct option is (b). All other options are not correct. Sponges ,bacteria and archaean is not common ancestor of all animals.