Understanding Lobster Anatomy and Evolution

What percentage of all known animal species are arthropods?

• 50%

• 60%

• 70%

• 80%

What significant anatomical difference did Geoffrey Saint-Hilaire observe between lobsters and humans?

• Lobsters have jointed legs on their ventral side.

• Lobsters have a circulatory system on their dorsal side.

• Lobsters have a mirror image anatomy along the dorsoventral axis.

• Lobsters have a brain on their dorsal side.

What evolutionary change is suggested to have occurred 600 million years ago in primitive worms?

• They began to walk upright.

• They grew exoskeletons.

• They started doing the backstroke.

• They developed wings.

In embryology, what determines the fate of cells on either side of the embryonic disk?

• The presence of oxygen.

• The expression of specific genes.

• The temperature of the environment.

• The amount of sunlight.

Which body plan is considered more recent according to studies of acorn worms?

• The fruit fly's body plan.

• The lobster's body plan.

• The human's body plan.

• The acorn worm's body plan.