Which of the following elements is considered an essential macronutrient for plants?
a. gold
b. manganese
c. calcium
d. nitrogen
e. copper
D
You might also like to view...
One reason we see relatively little genetic variation among human regional populations is that:
A. extensive migration among human populations has homogenized gene pools. B. extensive convergent evolution has homogenized gene pools. C. genetic drift has reduced variation in most regional populations over time. D. humans migrated out of Africa so recently that we haven't had enough time for regional variation to accumulate. E. None of the answer options are correct.
Sami stepped into a strange, new house but sensed something that brought back a whole flood of memories about his beloved grandmother from long ago. Which sense most likely brought these special memories back?
A) vision B) olfaction C) tactile D) hearing
Complement fixation is a more sensitive test for the presence of specific antibodies than are agglutination tests
Indicate whether the statement is true or false
How were insertion sequences (IS elements) first discovered?
What will be an ideal response?