A characteristic of homologous chromosomes is that: A. they carry alleles for the same genes in the same relative positions. B. they regularly exchange parts by crossing over at meiosis. C. they physically pair at meiosis. D. they are found in pairs but they do not physically pair in interphase in a diploid cell. E. all of the above.

List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.