strawberries
The organ system that removes wastes from the body
Excretory system
The organ system that moves blood throughout the body
circulatory system
The organ system that brings oxygen to body cells and removes waste gas
respiratory system
The organ system that uses information from the senses to control all body systems
nervous system
An offspring that is an exact copy of its parent
clone
All the rabbits living in one field are called a _______.
A. community
B. ecosystem
C. population
D. habitat
C. population
Which of these is a producer?
A. rabbit
B. grass
C. fox
D. hawk
B. grass
What is an abiotic factor?
A. a living thing
B. a plant
C. a nonliving part of an environment
D. an animal
C. a nonliving part of an environment
Which biome has frozen ground for much of the year?
A. desert
B. rainforest
C. tundra
D. grassland
C. tundra
What does a food chain show?
A. where animals live
B. the path energy takes
C. how plants grow
D. weather patterns
B. the path energy takes
Which is a consumer?
A. oak tree
B. grass
C. deer
D. algae
C. deer
Which biome is mostly made of cone-bearing trees?
A. taiga
B. tundra
C. desert
D. savanna
A. taiga
A frog depends on which abiotic factor?
A. insects
B. fish
C. water
D. algae
C. water
Why do plants need sunlight?
A. to stay warm
B. to make food
C. to find water
D. to attract animals
B. to make food
Which biome is located near the equator?
A. taiga
B. tundra
C. tropical rainforest
D. deciduous forest
C. tropical rainforest
Which food chain is correct?
A. grass → rabbit → fox
B. rabbit → grass → fox
C. fox → rabbit → grass
D. grass → fox → rabbit
A. grass → rabbit → fox
What is a food web?
A. one food chain
B. a list of animals
C. many connected food chains
D. a habitat map
C. many connected food chains
What helps make soil rich in a deciduous forest?
A. melting snow
B. falling and decaying leaves
C. strong winds
D. little rainfall
B. falling and decaying leaves
Why do algae live close to the surface of water?
A. to stay warm
B. to avoid fish
C. to get enough sunlight
D. to find soil
C. to get enough sunlight
An estuary is where ______.
A. two forests meet
B. freshwater and ocean water meet
C. mountains and valleys meet
D. rivers freeze
B. freshwater and ocean water meet
What is the main difference between a producer and a consumer?
A. producers are larger
B. consumers make their own food
C. producers make their own food
D. consumers live longer
C. producers make their own food
Which animal would most likely need special adaptations for cold winters?
A. monkey in a rainforest
B. camel in a desert
C. arctic fox in a tundra
D. parrot in a rainforest
C. arctic fox in a tundra
Plants in a forest compete mostly for ______.
A. sunlight
B. fur
C. shelter
D. feathers
A. sunlight
What do arrows in a food chain represent?
A. size of organisms
B. direction of energy flow
C. number of organisms
D. age of organisms
B. direction of energy flow
Which group belongs at the bottom of an energy pyramid?
A. carnivores
B. omnivores
C. herbivores
D. producers
D. producers