Question

please answer both questions thank you soo much!!

1) what do octopus ( cephalopods) and humans have in common?

2) is you discovered a new animal. How would you know whether it was likely from porifera, a cnidarian, a lophotrocozoan or a ecdysozoan?

Answer 1

1 cephalopodes has a complex eye like human it contain iris ,pupil and lens they can constrict and dialate their pupils according to light intensity .octopus has a rectangular pupil and have only one type of photoreceptor

2 porifera body asymmetrical, shape can be cylindrical ,rounded ,sac like , diploblastic animals do not have specialised digestive ,nervous or circulatory system ,have a water transport system for these functions

cnidarians radially symmetrical ,multicellular with few tissues . body contain mouth and inner cavity , asexual and sexual reproduction net like nervous system , both motile and sessile forms present , known as polyp and medusa

diploblastic animals layers seperated by jelly like mesoglea having special stinging cells known as nematocyst  

lophotrochozoans are triploblastic ,bilaterally symmetrical ,protostomes ,possess larval stage eighther lophophore or trochophore larva . concenteration of nervous tissue and sensory organs in the head of organism present

ecdysozoa characteristic feature is the three layered cuticle composed of organic material .it periodically molted as the animal grows . they shed their exoskelton . they are coelomates . runged nervous system . it contain segmented worms ,mollusc ,arthropodes , then jointed appendages and body segmentation are characteristic

by evaluating the above characteristics and anatomy of the organism we can classify the new animal