Why we measuring the rate of transpiration of plant every 3min by potometer

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

Which type of stimulus do mechanoreceptors detect? sound pain heat light

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.