What intermolecular force is responsible for holding the two strands of a dna double helix together?

Aplant may open end close its stomata to prevent excess water loss and maintain

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Some substances but not other can cross the (blank) membrane of a cell