Leukopenia is a condition characterized by a decrease in white blood cells. What effect does leukopenia have on the body's ability to fight infection?
Leukopenia increases the body's ability to fight infection.
Leukopenia decreases the body's ability to fight infection.
Leukopenia has no effect on the body's ability to fight infection.
Leukopenia increases the body's ability to fight infection at certain times and decreases it at other times.

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answer is

human impact on the environment can be seen in the deterioration of the !

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weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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