What often precedes mating?
Options:
- (A) A Greek letter
- (B) competition
- (C) friendship
- (D) birth of a child
- (E) death
- (F) Chemical energy
- (G) pregnancy
- (H) sweating
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Let's think first: Mating is generally preceded by courtship. Friendship usually precedes courtship, and courtship, marriage. Friendship often comes before mating.... So the answer is [(C)]

What feeds on plankton and nonliving organic matter?
Options:
- (A) bacteria
- (B) barnacles
- (C) animals
- (D) sharks
- (E) pythons
- (F) graptolites
- (G) molluscs
- (H) bears
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Let's think first: Bivalves feed on plankton and nonliving organic matter. Bivalve molluscs are very common. Molluscs feed on plankton and nonliving organic matter.... So the answer is [(G)]

Cells have multiple repair mechanisms to fix mutations in what?
Options:
- (A) Veins and arteries.
- (B) Most plants
- (C) the body's largest organ
- (D) members of their own species
- (E) wavelengths and photons
- (F) epidermis and dermis
- (G) deoxyribonucleic acid
- (H) peachleaf willow
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Let's think first: Cells have multiple repair mechanisms to fix mutations in DNA. DNA DNA is deoxyribonucleic acid. Cells have multiple repair mechanisms to fix mutations in deoxyribonucleic acid.... So the answer is [(G)]

Coral reefs provide what to many living beings in the ocean
Options:
- (A) Chemical energy
- (B) salt and water.
- (C) shelter and amusement
- (D) survival
- (E) important habitats
- (F) food and water
- (G) water and fun
- (H) food and shelter
--
Let's think first: Coral reefs provide food and shelter to many ocean organisms. Organisms or living beings are literally things that are alive. Coral reefs provide food and shelter to many ocean living beings.... So the answer is [(H)]

What can be found in moist soil near rivers and streams in tropical regions?
Options:
- (A) storing water
- (B) a fish
- (C) insects
- (D) Most plants
- (E) shrub beds
- (F) bioaerosols
- (G) ferns
- (H) reptilians
--
Let's think first: Caecilians can be found in moist soil near rivers and streams in tropical regions. Salamanders, frogs, toads, caecilians Class Reptilia. Reptilians can be found in moist soil near rivers and streams in tropical regions.... So the answer is [(H)]

What helps prokaryotes move?
Options:
- (A) sensory neurons
- (B) heat energy
- (C) Feet.
- (D) Wheels.
- (E) Hair-like projections.
- (F) Moving vans.
- (G) Chemical energy
- (H) kinetic energy
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Let's think first: Flagella help prokaryotes move. Flagella are hair-like projections from the surface of cells. Hair-like projections from the surface of cells that help prokaryotes move.... So the answer is [(E)]