Ajellyfish is a type of cnidarian, a squid is a type of mollusk, and a dolphin is a type of vertebrate. which two characteristics are present in both a squid and a dolphin, but not present in a jellyfish?

Jellyfish do not have a central nervous system.

Squids which belongs to Cephalopoda (class of Mollusca) have the most complex nervous system of the invertebrates. They have well-developed senses and large brains. So, they are considered as the most intelligent of the invertebrates.

Dolphins, on the other hand, are  regarded as one the most intelligent animal.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.