1. nervous systems are required by animals to respond to stimuli and have complex senses such as taste, touch, sight, smell, or sound. these are carried by nerves to and from the brain and spinal cord. of all major animal phyla, which does not have nerves?

a. annelids
b. porifera
c. chordata
d. cnidarians

B. Porifera. Porifera (sponges) is the only major phyla without nerves

Of all the major phyla the one that does not have a proper nervous system is the Porifera.

Option B

Explanation:

Any organism requires a nervous system to communicate between the activity center that is the brain. The nerves serve as communication vehicles between the brain and other parts of the body .

The phylum porifera majorly contains the sponges which do not have any nerve or brain cells . Their major communication between cell to cell is the circulation of water and the ejection of waste that occurs from the inside to the outside.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

answer: oof wait

explanation: