In the neritic zone, a 10-milliliter sample of surface water can contain ____ of multicellular planktonic organisms
a. hundreds
b. thousands
c. millions
d. billions
e. trillions
B
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The oldest known plant is called King's holly. Why is it sterile? a. It has lost the female reproductive structures
b. It has no pollinator. c. It has three sets of chromosomes. d. It has lost the male reproductive structures. e. It has too many of the male and female reproductive structures.
Continued widespread use of the phenolic compound triclosan is advantageous in that it is important to remove as many organisms as possible from our hands and there is little risk of resistant organisms evolving.
Answer the following statement true (T) or false (F)
Parathyroid hormone also activates ________ in the kidneys.
A. vitamin D B. vitamin C C. vitamin B D. calcium E. cholesterol
Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.
A. postzygotic, ecological B. prezygotic, behavioral C. prezygotic, temporal D. prezygotic, gamete fusion E. postzygotic, mechanical