Line 1: *Adult sponges produce eggs and sperm. Sponges are the most primitive multicellular animals. The most primitive multi-cellular animals produce eggs and sperm.*
*(B)*
Line 2: *The most primitive multi-cellular animals produce what?
Options:
- (A) Electrical energy
- (B) eggs and sperm
- (C) harmful substances
- (D) scarce resources
- (E) Organic compounds
- (F) Chemical energy
- (G) fur and fat
- (H) aerobic capacity*

Logic of a solution: *Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.*
*(G)*
The original question: *What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish*

Line 1: *Most fungi get organic compounds from dead organisms. Fungi include yeasts, molds, and fleshy fungi. Molds get organic compound from dead organisms.*
*(A)*
Line 2: *What do most molds get their organic compounds from?
Options:
- (A) dead organisms
- (B) particles in the air
- (C) fossil fuels
- (D) aqueous solution
- (E) burning coal
- (F) living organisms
- (G) swamp vegetation
- (H) sunlight*

Logic of a solution: *Antigens are found on cancer cells and the cells of transplanted organs. Antibodies bound to antigen are then measured by RCAT-based amplification of the associated DNA tag. Cells bound by antibodies can be found on cancer cells and the cells of transplanted organs.*
*(G)*
The original question: *Where can cells bound by antibodies more likely be found?
Options:
- (A) critical organs
- (B) colder and wetter
- (C) the environment
- (D) Earth orbiting the Sun
- (E) Veins and arteries.
- (F) epidermis and dermis
- (G) on cancer cells
- (H) the skin*

Line 1: *Adult tunicates are barrel-shaped. Urochordates are commonly called tunicates. Adult urochordates are barrel-shaped.*
*(E)*
Line 2: *Adult urochordates are _-shaped.
Options:
- (A) Length
- (B) a prism
- (C) fossils
- (D) grow
- (E) barrel
- (F) fertile
- (G) Grow well
- (H) revolving*

Line 1: *Mammals generate heat mainly by keeping their metabolic rate high. And resting metabolic rate is a big contributor to calories burning. Mammals generate heat mainly by burning calories.*
*(E)*
Line 2:
*Mammals generate heat mainly by what?
Options:
- (A) hugging mammals
- (B) calorie counting
- (C) with their fur
- (D) energy of moving objects
- (E) burning calories
- (F) sweating
- (G) selling fur coats
- (H) flow of electrons*