During a "leap year" we add an extra day to our calendar because:
A. The Earth takes 24 hours to rotate
B. The moon takes 27.3 days to orbit
C. Earth takes 365.5 days to revolve
D. The moon takes 29.5 days to orbit

A.The Earth takes 24 hours to rotate

Explanation:

Since there is an extra day that means an addition of 24hrs

interphase   is the cell cycle stage in which the cell acquires nutrients, creates and uses proteins and other molecules and starts the process of cell division by replicating the dna. it is the longest stage in the eukaryote cell cycle.

the following   can go wrong during interphase:   a base pair could be mismatched during the duplication process causing a mutation.   correct answer: c

explanation:

creative diagnostics provides a protocol for total protein extraction based on ripa which is widely used.