Which soil region is the top layer of surface litter, such as twigs and leaves?
a. A horizon
b. B horizon
c. C horizon
d. D horizon
e. O horizon
E
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The relative percentage of genes devoted to protein synthesis in small-genome organisms is high compared with that of large-genome organisms
Indicate whether the statement is true or false.
As the cat’s offspring continue to suckle, this stimulates the production of more milk from the
mammary glands. This is an example of __________.
a. positive feedback b. negative feedback c. homeostasis d. both negative feedback and homeostasis
What is the correct sequence of structures through which air passes through on the way into the mammalian lung?
A. larynx ? pharynx ? trachea ? bronchi ? bronchioles ? alveoli B. alveoli ? bronchioles ? bronchi ? trachea ? larynx ? pharynx C. pharynx ? larynx ? trachea ? bronchi ? bronchioles ? alveoli D. pharynx ? trachea ? larynx ? bronchi ? bronchioles ?alveoli E. bronchi ? bronchioles ? pharynx ? larynx ? trachea ? alveoli
Which of the following is one method in which a change in the DNA leads to genetic changes in a population?
A) genetic drift B) mutation C) founder effect D) bottleneck effect