a duck is not an invertibrate becaus invertibrates are "anything" whithout a spinal column or back bone.(mammals, reptiles, fish, and amphibians such as frogs are vertebrates.)anything that is not one of these<-, is an invertebrate.
Yes It Is A Invertibrate
a grasshopper is an invertibrate
yes yes it is an invertibrate
hag fish is invertibrate having skull but no vertebral column
no its an Arachnid
yes
because we have bones
Yes
yes it is
yes
yes
yes