Physiology Innate immunity . Group of answer choices depends on an infected animal's previous exposure to the same pathogen utilizes highly specific antigen receptors on B cells is based on recognition of antigens that are specific to different pathogens is found only in vertebrate animals is activated immediately upon infection

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.