Question

For questions #65 – 70: If the organisms in the phylum or clade on the list have: An endoskeleton - Put "A" An exoskeleton or shell - Put "B" Neither A or B types of skeleton - Put "C" LIST: 65. Arthropoda 66. Dipnoi 67. Cnidaria 68. Actinopterygii 69. Brachiopoda 70. Porifera

Answer 1

An endoskeleton is the internal structure of the organism which holds the body by bing or cartilaginous structure made up of mineralised material.

Exoskeleton is similar bas endoskeleton but one difference is that it is external to the body and sometimes called shells.

65)Arthropoda have exoskeleton -B

66)Dipnoi have endoskeleton -A

67)Cnidaria -C Because neither of these is present.

68)Actinopterygii-A

69)Brachiopoda have outer shell-B

70)porifera-have endoskeleton made up of spicules which is made up of calcium carbonate ,silica or spongin.

Though Cnidaria have hydrostatic skeleton but this are not made up of the usual components of skeleton and its is called skeleton for their function using water but they actually don't have skeleton like endo or exo.

Thank you