What is the purpose of a control sample that is known to be from bighead carp in eDNA surveillance for bighead carp?
A. To use as a negative control to compare with the markers of
known fragment sizes
B. To use as a positive control to compare with the markers of known
fragment sizes
C. To use as a positive control to see if there are bighead carp
present in the area
D. To use as a negative control to see if there are bighead carp
present in the area

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.

because it travels in smaller waves then all other colors, causing it to be the most visible color

i took a test for bio that had this question and these were the correct answers, not sure if this is any now lol

the nervous system and the muscular system work together.  

sweat reaches the surface of the skin and evaporates into the air.

muscles underneath the skin relax, causing hair on the skin to lay flat.