What statement best describes “biology”?
a. The science of life
b. The naming of organisms
c. The study of natural selection
d. The measurement of populations
e. The study of how organisms are related to one another
a
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How is the net primary productivity of an ecosystem calculated?
What will be an ideal response?
Which of the following may occur in meiosis but not in mitosis?
A. DNA replication B. chromosome condensation C. metaphase D. cytokinesis E. crossing-over
Ancestors of the Galapagos finches had two different types of seeds to eat on some islands. Some seeds were very small, and required small beaks to handle. Other seeds were very large and required large strong beaks to crack. This led to ____ among the Galapagos finches.
The chemical signal sent out by macrophages to mobilize the immune system is
A. interleukin-2. B. interferon. C. interleukin-1. D. perforin.