Which of the following best describes an example of a specific internal response to harmful bacteria? skin serves as a physical barrier that prevents bacteria from entering the body. saliva contains enzymes that destroy bacteria and prevent infection. bacterial infection causes the release of histamine, which leads to inflammation and swelling. antigens trigger the production of antibodies, which mark bacteria for destruction.

bacterial infection causes the release of histamine, which leads to inflammation and swelling.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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.

here's your answer.