Which of the following is true of a human karyotype? a. each cell has 22 pairs of homologous chromosomes b. each cell has one pair of sex chromosomes c. the chromosomes are numbered in order from 1 to 22. d. all of the above are true.

cats appear to have glowing cat eyes because the back of their eyeballs includes a special reflective surface called the tapetum lucidum. this lets them see better during the night, giving them a much better vision.

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.

explanation: