D. an arctic fox is brown in summer and white in winter
Answer:
Option D, A subject is observed both before and after two exposures to the treatment.
Explanation:
In A-B-A-B design the alphabets have following meaning
a) First A – It is the baseline value or the value measured before treatment
b) First B – It is the treatment measurement
c) Second A - It is the withdrawal of treatment
d) Second B – It is the reintroduction of treatment
The second A is known as the reversal phase in which the intervention is withdrawn to see if the target behavior returns to the baseline behaviour
Thus , there are two measurements involved one before the intervention and second after the intervention
Option D is correct
Irritable Bowel Syndrome or IBS for short is known to be a common disorder that affects the colon. IBS causes alternating patterns of constipation and diarrhea. In treating IBS, it requires dietary changes and some medications, especially antibiotics. Some known medications made for IBS patients are known as Lotronex and Amitiza.
The answer is d. dormancy.
Dormancy is physiological condition during which growth and development are temporarily stopped. The aim of this condition is to preserve energy by minimizing metabolic activity, usually because of inadequate environmental conditions.
Dispersal refers to movement of individuals from one site to another. Fertilization means a fusion of gametes to develop a new organism.
Germination is a process of growing plant from a seed.
