Most studies indicate that tobacco and marijuana tend to be a. substitutes. b. complements. c. unrelated because one good is legal while the other one is illegal. d. inferior goods.

Answer is option "b"Explanation:The complement systems are a key natural insusceptible barrier against disease and a significant driver of irritation; in any case, these very properties can likewise cause hurt. Unseemly or uncontrolled initiation of compliment can cause nearby as well as fundamental irritation, tissue harm and ailment. Complement gives various choices to tranquilize advancement as it is a proteolytic course that includes nine explicit proteases, one of a kind multimolecular enactment and lytic edifices, a stockpile of characteristic inhibitors, and various receptors that dilemma to actuation sections. Medication configuration is encouraged by the undeniably itemized basic comprehension of the atoms associated with the complement system. Just two enemies of compliment drugs are as of now available, however, a lot more are being produced for sicknesses that incorporate irresistible, provocative, degenerative, horrible and neoplastic disorders.Hence, the right answer is option b "Complements".\

B.) nitrogen fixationnitrogen fixation is the process of nitrogen molecules seeping into the soil and inside plant roots and bacteria. it gives more "life" to plants