The lowest stimulus intensity required for detection is the and the smallest noticeable difference between a standard stimulus intensity and another stimulus value is the
a. response criterion; sensory constant
b. absolute threshold; difference threshold
c. base value; just noticeable difference (jnd)
d. difference threshold; absolute threshold
e. notice threshold; absolute threshold

The correct answer is B) absolute threshold; difference threshold.

The lowest stimulus intensity required for detection is the absolute threshold and the smallest noticeable difference between standard stimulus intensity and another stimulus value is the difference threshold.

The difference threshold is also known as "the just noticeable difference or JND." It is the minimum level of stimulation that an individual is able to perceive fifty percent of the time. In the case of the absolute threshold, it is the smallest detectable level of stimulation.

the index of refraction of the second medium is higher. i just took the test trust me !

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.