Which statement describes one characteristic of index contour lines? O They appear thinner and lighter than other lines on a map.
They show regions where a difference in elevation exists.
O They show the locations of roads and paths on the landscape.
They show ratios used to determine the actual distance on a map.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

Before classifying insects into different orders,review the larger classification for insects: • kingdom: animalia • phylum : arthropoda • class : insecta conduct research online to determine the characteristics an organism must have to be classified in each of the taxonomy levels shown. note the characteristics you find in the answer space.