How do scientists usually test for one variable

The indipendant variable  and the control and dependant variable

Explanation: Scientists identify what they want to test the independant variable and then they set up controls as a way of quality control and measure it which is the dependant variable hope this helps god bless

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:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.