AP BIOLOGY

Detailed explanation-1: -All cnidarians have two membrane layers in the body: the epidermis and the gastrodermis; between both layers they have the mesoglea, which is a connective layer. Cnidarians carry out extracellular digestion, where enzymes break down the food particles and cells lining the gastrovascular cavity absorb the nutrients.

Detailed explanation-2: -Most cnidarians have two tissue layers. The outer layer, the ectoderm, has cells that aid in capturing food and cells that secrete mucus. The inner layer, the endoderm, has cells that produce digestive enzymes and break up food particles. The jellylike material between the two layers is called the mesoglea.

Detailed explanation-3: -There are two tissue layers: the epidermis, which lines the outside of the animal, and the gastrodermis, which lines the inside of the animal. These layers are separated by a nonliving layer of elastic, gelatinous material known as the mesoglea, which provides structure and buoyancy without metabolic cost.

Detailed explanation-4: -Tissues and muscles Cnidarians consist of two cell layers: an outer ectoderm and an inner endoderm (the gastrodermis) that lines the coelenteron.

Detailed explanation-5: -All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Animals in this phylum display two distinct morphological body plans: polyp or “stalk” and medusa or “bell” (Figure 2). An example of the polyp form is Hydra spp.; perhaps the most well-known medusoid animals are the jellies (jellyfish).