Which is the primary advantage of instincts, such as the tendency of a mother bear to attack anything between herself and her cubs? a) they improve survival rates. b) they reduce predator contacts. c) they improve food selection choices. d) they allow for smaller brains and less wasted energy.

answer is a

Explanation: i just did the usa test prep

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.