Why is it that the typical diploid chromosome number of many organisms including human beings is an even number?
A. It is only a coincidence.
B. Chromosomes duplicate before cell division.
C. Both parents contribute equal number of chromosomes.
D. Meiosis reduces chromosome number.

Select all the correct answers. for a claim about the natural world to be considered scientific, what attributes must it have? a). it must be open to modification if new evidence doesn't completely support it. b). it must be based on scientific observations that can be repeated in a controlled setting. c). it must be applicable to future events and occurrences. d). it must be consistent with only a small portion of relevant observations or data.