Humans can cause an ecosystem to collapse by: a. collecting and chemically altering industrial waste to detoxify it. b. reducing habitat fragmentation. c. hunting a keystone species to extinction. d. building shelter belts next to farm fields.

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

1. is geographic distribution

2 is increasing complexity

3 is transitional forms