In humans, the ability to detect changes in the external environment depends upon the presence of A) effectors
B) glands
C) receptors
D) muscles

2. if someone had the list of traits you provided in question 1, do you think he or she would be able to find you in a group of 1000 people? why or why not? if not, what other information encoded in your genes might distinguish you from the others in the group? what are other traits that are encoded for by dna?

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

Which of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin