What keeps mammals warm?
Options:
- (A) evaporation
- (B) Animal fur
- (C) staying warm
- (D) sweating
- (E) They have thick fur
- (F) with their fur
- (G) a layer of fat
- (H) Veins and arteries.
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Let's think first: Mammals have a layer of fat under the skin to help insulate the body. Glass insulation keeps beverage warm for hours. Mammals have a layer of fat under the skin to keep them warm.... So the answer is [(G)]

Biodiversity increases the what of islands?
Options:
- (A) water source
- (B) stability
- (C) Plants growth
- (D) our planet
- (E) luminescence
- (F) environment
- (G) human population
- (H) allow growth
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Let's think first: Biodiversity increases the productivity and stability of ecosystems. Islands are delicately balanced ecosystems. Biodiversity increases the stability and productivity of islands.... So the answer is [(B)]

Chromosomes contain genes, which code for
Options:
- (A) Most plants
- (B) Plants growth
- (C) body tissue
- (D) Animal survival
- (E) animals
- (F) Chemical energy
- (G) peachleaf willow
- (H) A Greek letter
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Let's think first: Chromosomes contain genes, which code for proteins. Protein builds and repairs body tissue. Chromosomes contain genes, which code for body tissue.... So the answer is [(C)]

What helps to insulate and protect the body?
Options:
- (A) tail fins
- (B) Animal fur
- (C) fur seals
- (D) keratin
- (E) nitrogen
- (F) snow
- (G) Epidermis
- (H) poultry
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Let's think first: Hair helps to insulate and protect the body. Hair is composed of the protein keratin. The protein keratin helps to insulate and protect the body.... So the answer is [(D)]

Where is the sea tiger found?
Options:
- (A) eroded
- (B) ocean
- (C) warm
- (D) fossils
- (E) dense
- (F) ligt
- (G) embryos
- (H) dead
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Let's think first: Marine biomes are found in the salt water of the ocean. Another animal that lives within the Marine Biome is a sea tiger. Sea tigers are found in the salt water of the ocean.... So the answer is [(B)]

Mitosis is out of control due to what?
Options:
- (A) fire
- (B) infection
- (C) cancer
- (D) viruses
- (E) pathogens
- (F) Winter
- (G) death
- (H) pesticide
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Let's think first: Cancer cells divide more often than normal cells, and grow out of control. Mitosis is a process by which cells divide. Cancer Mitosis is out of control.... So the answer is [(C)]