How is the pollen of pine trees primarily disseminated?
a. birds
b. wind
c. water
d. insects
e. mammals
b
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Functions of the mantle in clams include
(a) secreting the shell. (b) forming pearls around irritating grains of sand. (c) forming the incurrent and excurrent siphons. (d) all of the above.
Answer the following statements true (T) or false (F)
1. All infectious diseases are caused by pathogens. 2. Pathogens greatly outnumber nonpathogens. 3. Using microorganisms to clean up the environment is known as bioremediation. 4. Microorganisms are essential in the field of genetic engineering. 5. Microorganisms probably appeared on earth about 3.5 million years ago.
DNA studies can be used to make all of the following conclusions except that
A. The gibbon ape line diverged about 15 million years ago. B. Orangutans split off about 10 million years ago. C. The gorilla lineage diverged about 8 million years ago. D. Modern man remained changeless for the last 1 million years.
Members of the California sheephead fish species begin their life as females and then become males. This is referred to as
A) sequential hermaphroditism. B) dioecious. C) transgenderism. D) autogamy.