单项选择题

When predators control fails, nature brings animals population into balance by ______.

A．eliminating the number of predators
B．increasing the number of other animals
C．seeking the help of disease to reduce other animals
D．replacing the number of predators immediately
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单项选择题
According to the passage; through which of the following is the energy released in the Sun pass before it becomes light
A．Electromagnetic space.
B．The solar surface.
C．The X-ray part of the spectrum.
D．Interplanetary space.
单项选择题
According to the passage, which of the following is used in explaining a muscle movement
A．The flow of blood to the muscles.
B．Classical conditioning.
C．Protein interaction.
D．Stimuli through the cells.
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