Changes in what are essential for evolution to occur.
Options:
- (A) color of leaves
- (B) genetic material
- (C) learned behavior
- (D) synthetic material
- (E) the body's largest organ
- (F) acquired characteristics
- (G) sensory neurons
- (H) Most plants
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Let's think first: Mutations are essential for evolution to occur. Mutations are changes in the genetic material. Changes in the genetic material are essential for evolution to occur.... So the answer is [(B)]

Girls have used what to learn behaviors for generations?
Options:
- (A) Birds
- (B) trees
- (C) rainbows
- (D) sound
- (E) alleles
- (F) bows
- (G) nerves
- (H) dolls
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Let's think first: Behaviors can be learned through play. Girls have played with dolls for generations. Girls have used dolls to learn behaviors for generations.... So the answer is [(H)]

What is needed from cells for phosphatases to keep the proper ph?
Options:
- (A) plasma
- (B) secretion of bases only
- (C) secretion of proteins
- (D) metabolic reaction
- (E) it helps plants in growing
- (F) Positive charges
- (G) Transfers energy
- (H) secretion of acids and bases
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Let's think first: Cells secrete acids and bases to maintain the proper pH for enzymes to work. Phosphatases are enzymes that remove phosphates from other enzymes. Cells secrete acids and bases to keep the proper pH for phosphatases to work properly.... So the answer is [(H)]

What is usually chosen in evolution?
Options:
- (A) common traits
- (B) Plant reproduction
- (C) advantageous systems
- (D) undesirable traits
- (E) Animal survival
- (F) competition
- (G) mysterious sytems
- (H) Earth revolving around the sun
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Let's think first: Evolution occurs by a process called natural selection. Natural selection only selects functionally advantageous systems. In evolution only functionally advantageous systems are selected.... So the answer is [(C)]

How do cells grow and repair themselves?
Options:
- (A) mitosis
- (B) alveoli
- (C) retina
- (D) rest
- (E) recovery
- (F) exercise
- (G) ligt
- (H) mechanical
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Let's think first: Cell division is how organisms grow and repair themselves. Mitosis is cell division. Organisms grow and repair themselves through mitosis.... So the answer is [(A)]

How can animals with six legs detect sound?
Options:
- (A) thorax
- (B) Refract it
- (C) electricity
- (D) they bend
- (E) wings
- (F) environment
- (G) pupils
- (H) antennae
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Let's think first: Some insects can use their antennae to detect sound. Every insect has six legs, that's an insect. Animals with six legs can use their antennae to detect sound.... So the answer is [(H)]