Q.Observe the animal below and answer the following questions
a. Identify the animal
b. What type of symmetry does this animal exhibit?
c. Is this animal Cephalized?
d. How many germ layers does this animal have?
e. How many openings does this animal’s digestive system have?
f. Does this animal have neurons?

Step 1. Identify the animal. The photo shows a soft, columnar orange-red body fixed to a rock, crowned with a ring of slender tentacles surrounding a central mouth, with no shell, head, or jointed appendages. This is the classic body plan of a sea anemone (Class Anthozoa, Phylum Cnidaria/Coelenterata).

Step 2. Symmetry. The tentacles are arranged evenly all around the central oral-aboral axis, so any plane passing through that axis divides the body into mirror-image halves — this is radial symmetry, typical of Cnidaria (and also seen in adult Echinodermata).

Step 3. Cephalization. There is no concentration of sense organs or nervous tissue at one end into a head; cnidarians show no cephalization at all.

Step 4. Germ layers. Cnidarians develop from only two embryonic germ layers — an outer ectoderm and inner endoderm — with a non-cellular jelly-like mesoglea between them, so they are diploblastic (two germ layers, no true mesoderm). …

Identify the phylum from the external body plan visible in the photograph (tentacle crown around a central mouth, columnar body, no head, no shell/jointed limbs), then apply the s …

• Mistaking the tentacle-ring appearance for bilateral symmetry because the animal superficially looks like a flower
• Assuming the presence of a nerve net means the animal has a brain or is cephalized …