Logic of a solution: *Most invertebrates have a more complex nervous system. Cephalopods have well developed nervous systems with complex brains capable of learning. Most invertebrates have brains capable of learning.*
*(F)*
The original question: *Most invertebrates have brains capable of what?
Options:
- (A) telepathy
- (B) movement
- (C) telekinesis
- (D) allow growth
- (E) animals
- (F) learning
- (G) relocation
- (H) power*
Line 1: *Populations of viruses do not grow through cell division because they are not cells. Prokaryotes multiply by simple cell division, forming clones or exact copies of themselves. Viruses are not prokaryotes.*
*(H)*
Line 2: *What are viruses not?
Options:
- (A) self-copies
- (B) an object
- (C) HIV
- (D) humans
- (E) infectious
- (F) homogenous
- (G) dangerous
- (H) prokaryotes*
Logic of a solution: *Fission takes place when an animal divides into two parts. If the nucleus breaks up into lighter elements, it is called fission . The nucleus breaks up into lighter elements when an animal divides into two parts.*
*(G)*
The original question: *What breaks up into two lighter elements when an animal divides into two parts?
Options:
- (A) the blood cells
- (B) the heart
- (C) Energy.
- (D) the main element
- (E) heat energy
- (F) light energy
- (G) the nucleus
- (H) sensory neurons*
Line 1: *Most plants continue to grow throughout their lives. Lilies continually produce new bulbs, from which grow new plants. Lilies continue to grow throughout their lives.*
*(F)*
Line 2: *What continues to grow throughout their lives? 
Options:
- (A) potatoes
- (B) Hemoglobin
- (C) tortoises
- (D) plastic roses.
- (E) Human teeth.
- (F) Lilies.
- (G) Silk daisies.
- (H) vegetation*
Logic of a solution: *Biomass is the total mass of organisms at a trophic level. Each stage is a trophic level. Biomass is the total mass of organisms in an environmental stage.*
*(H)*
The original question: *The total mass of organisms in an environmental stage is called what?
Options:
- (A) food pyramid
- (B) extinction
- (C) ecological pyramid
- (D) food chain
- (E) vegetation
- (F) food
- (G) ligt
- (H) biomass*
Logic of a solution: *Echinoderms lack a centralized nervous system. Echinoderms include starfish, sea urchins, and sea cucumbers. Starfish, sea urchins and sea cucumbers lack a centralized nervous system.*
*(D)*
The original question:
*Starfish, sea urchins and sea cucumbers lack a what?
Options:
- (A) characteristics
- (B) the body's largest organ
- (C) watery habitat
- (D) centralized nervous system
- (E) functioning arm
- (F) underwater life
- (G) biological diversity
- (H) epidermis and dermis*