Logic of a solution: *Echinoderms have a unique water vascular system with tube feet. Echinoderms are represented by the starfish. Starfish have a unique water vascular system with tube feet.*
*(B)*
The original question: *What kind of animals has a water vascular system with tubed feet?
Options:
- (A) animals
- (B) starfish
- (C) reeds
- (D) insects
- (E) warm-blooded
- (F) sponges
- (G) sea coral
- (H) four limbs*
Line 1: *Trees have woody stems covered with bark. Cinnamon sticks are simply pieces of tree bark. Woody stems are sometimes covered by material used to make cinnamon sticks.*
*(G)*
Line 2: *What are sometimes made from the material that covers woody stems?
Options:
- (A) shrub beds
- (B) solid geometric shapes
- (C) saffron
- (D) Organic compounds
- (E) turmeric
- (F) mustard seed
- (G) cinnamon sticks
- (H) layers of fat*
Logic of a solution: *Ozone depletion results in higher levels of UV radiation reaching Earth. Ozone is represented chemically as O3. O3 depletion results in higher levels of UV radiation reaching Earth.*
*(A)*
The original question: *The depletion of what results in higher levels of uv radiation reaching earth?
Options:
- (A) O3
- (B) O2
- (C) oil
- (D) pan
- (E) h2o
- (F) CO2
- (G) DNA
- (H) DDT*
Line 1: *Fungi lack chlorophyll, so they cannot make food by photosynthesis as plants can. If the plant is green, it is a producer. Fungi lack chlorophyll, so they cannot make food by photosynthesis as producers can.*
*(B)*
Line 2: *What do fungi lack that make them unable to make food as producers can?
Options:
- (A) scattered light
- (B) chlorophyll
- (C) Energy.
- (D) sunlight
- (E) Energy
- (F) acetic acid
- (G) Chemical energy
- (H) energy usage*
Logic of a solution: *Mutations are essential for evolution to occur. Natural selection is the mechanism of evolution. Mutations allow for natural selection to occur.*
*(B)*
The original question: *What enables natural selection to occur?
Options:
- (A) environment
- (B) mutations
- (C) competition
- (D) relocation
- (E) Darwin
- (F) evolutionary development
- (G) root growth
- (H) research*
Logic of a solution: *Most protists have motility. All animals are motile, moving about at some point in their life cycle. Most protists are able to move.*
*(E)*
The original question:
*Which can move?
Options:
- (A) Raft
- (B) light energy
- (C) vehicles
- (D) insects
- (E) protists
- (F) bicycle
- (G) animals
- (H) an object*