Of these things in an environment, which one is a living thing?
air
river flowing down a mountain
mushrooms sprouting
clay on the side of the riverbank
mushrooms sprouting
One reason animal cells don't need a central vacuole is because they often have smaller vacuoles for storage. What is another reason animal cells don't need central vacuoles?
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1 point
Animals do not produce their own food.
Animal cells have cell walls.
Animal bodies have skeletons or other means of providing structure.
Animal bodies have skeletons or other means of providing structure.
Which statement is correct about organelles that provide energy?
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1 point
They are found only in animal cells.
They are responsible for cellular respiration.
They are found only in plant cells.
They are responsible for cellular respiration.
Unicellular cells must carry out ___ of life.
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1 point
all functions
a single function
specific functions
a few functions
all functions.
Which system is most complex?
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1 point
cells
organs
organ systems
organ systems.
Which statement is true?
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1 point
Bones help the heart pump blood.
Bones are composed of a single layer.
Bones provide shape to the body.
Bones are organ systems.