What is the circulatory system carries chemical signals know as

What is the animal called that eats plants

What is a tubelike digestive space with an opening at each end is called a

What is cnidarians have a simple nervous system known as a

What is a chamber that pumps blood out of a vertebrate heart is called a

What is a digestive space with a single opening

What is flatworm remove excess water through a system of tubes connected to

What is in most animals a ---------------------- grinds food into a watery paste

What is blood stay inside the vessels at all times in a

What is a sponge gets food by