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.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

answerlength of time the medication is in contact with the skin(moistur level of the skin) depth of respirations blood supply to the area; all of the above; ///