Q: Fact 1: Mutations may change the structure of a chromosome or just change a single nucleotide. Fact 2: Nucleotides are the building blocks of DNA . Given the two facts above, mutations may change the structure of the what of DNA? | OPTIONS:
- personalities
- mutations
- solid, liquid, gas
- building blocks
- gastropod shells
- Veins and arteries.
- hosts
- an organism's body
A: building blocks

Q: Fact 1: Arthropods have a life cycle with sexual reproduction. Fact 2: An ant and a lobster are both arthropods. Given the two facts above, what have a life cycle with sexual reproduction? | OPTIONS:
- insects
- graptolites
- minerals
- bacteria
- barnacles
- lobsters
- animals
- fungus
A: lobsters

Q: Fact 1: Hair is a fiber that is found only in mammals. Fact 2: Sebaceous glands associated with hair follicles protect the skin of mammals. Given the two facts above, what protects a mammal's skin? | OPTIONS:
- Fiber follicles
- Exfoliation
- resistance
- layers of fat
- evaporation
- a cuticle
- sensory neurons
- fur and fat
A: Fiber follicles

Q: Fact 1: Scales are used for protection by scaled animals. Fact 2: Fish scales are also composed of chitin. Given the two facts above, chitin can be used for protection by whom? | OPTIONS:
- Fungi
- People
- Man
- Fish
- trees
- Dogs
- animal
- Birds
A: Fish