Answer:
a. more than one pathway at the same time.
Explanation:
Basically, RTK (receptor kinase receptor) principally activate many different transduction pathways about 10 or more and many cellular response in living cells.Thus, its activates more than one signal transduction pathways at once, (compare to G-protein ), and with this mechanisms it aids in coordination of some aspects of cell growth and cell reproduction .
Jungermanniaceae family ex. Liverwort can with stand the high level of nitrogen in the outer surface of the volcanoes.
The relationship between a leech and a crocodile is an example of parasitism, as the leech feeds on the alligator's blood.
Most likely Endocrinology. Endocrinology is a bracnh of biology and medicine that deals with the endocrine system ( the system that produces hormones).