What learns to behave through playing?
Options:
- (A) otters
- (B) bacteria
- (C) viruses
- (D) rocks
- (E) lions
- (F) animals
- (G) humans
- (H) Birds
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Let's think first: Playing is just one of many ways that mammals and other animals learn how to behave. Mammals include lions, bears, dogs, horses, cattle and antelopes. Playing is one way that lions learn how to behave.... So the answer is [(E)]

What do plants build their cell walls from?
Options:
- (A) By wind and rain
- (B) Deposition
- (C) Deposition.
- (D) algae
- (E) Chemical energy
- (F) plant wall
- (G) plant material
- (H) polysaccharides
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Let's think first: Plants use cellulose for their cell walls. Another important polysaccharide is cellulose. Plants use a polysaccharide for their cell walls.... So the answer is [(H)]

What group of animals are a tetrapod vertebrate that produce amniotic eggs?
Options:
- (A) class Reptilia
- (B) warm-blooded
- (C) more abundant
- (D) graptolites
- (E) animals
- (F) insects
- (G) mammals
- (H) barnacles
--
Let's think first: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. Reptilia contains over 7800 entries on numerous species of reptiles. Animals in the class Reptilia are a class of tetrapod vertebrates that produce amniotic eggs.... So the answer is [(A)]

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
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Let's think first: 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.... So the answer is [(B)]

Why do male gametes swim from male to female reproductive organs?
Options:
- (A) temperature changes
- (B) to leave the egg
- (C) fertilization
- (D) competition
- (E) it needs them
- (F) to feed
- (G) permineralization
- (H) to heal themselves
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Let's think first: Sperm had to swim from male to female reproductive organs for fertilization. Male gametes are called sperm. Male gametes had to swim from male to female reproductive organs for fertilization.... So the answer is [(C)]

Where in a cell are ribosomes located?
Options:
- (A) outside the nucleus
- (B) Most plants
- (C) solid, liquid, gas
- (D) allow growth
- (E) Veins and arteries.
- (F) Earth orbiting the Sun
- (G) Chlorophyll
- (H) the body's largest organ
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Let's think first: Ribosomes are structures in the cytoplasm where proteins are made. Outside the nucleus is cytoplasm. Ribosomes are structures outside the nucleus where proteins are made.... So the answer is [(A)]