Bio Lab Final Slides

• Bilateral like cockroaches you can cut them in half.
• Radial like jellyfish they are a circle.
• No symmetry.

• In a closed circulatory system like the earthworm blood/oxygen flows from the heart splits up to travel to each organ and loops backs to the heart. An open system found
• in clams and grasshoppers, oxygen flows to the heart then splits up to the
• organs. Instead of true blood some species have hemolymph.

Incomplete metamorphosis only has three life cycle stages: egg, nymph, and adult. Complete metamorphosis has four distinct life cycle stages: egg, larva, pupa, and adult. The larva can be very different from the adult. The larvae eat constantly and grow rapidly.

During an embryo's development a hole called a blastopore develops. In a protostome the blastopore becomes the mouth first. In a deutorostome the blastopore becomes the anus first.

• Porifera      (sponge, no symmetry)
• Cnidaria     (jellyfish, radial)
• Platyhelminthes (planarian, bilateral)
• Annelida     (earthworm, bilateral)

• Cranial-head
• Dorsal-top
• ventral-belly
• anterior-heard
• posterior-butt

• Shark Brain