The approximate age of the Earth is:
a. 100,000 years.
b. 1.2 billion years.
c. 4.6 billion years.
d. 10.5 billion years.
e. 13.6 billion years.
C
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Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen. B. stimulating components of the immune system through the release of cytokines. C. blocking or reducing the inflammation response in mucous membranes. D. stimulating the production of specific antibodies. E. recruiting macrophages to the nasal epithelium.
English ivy (Hedera helix) and wintercreeper (Euonymus fortunei) are not closely related, yet both have aerial rootlets that allow them to climb up and stick to bark on trees. What type of evolution is this?
A. Analogous. B. Convergent. C. Radial. D. Bivalent. E. Both analogous and convergent.
The peppered moths showed an example of ___________(type of natural) selection when their wings showed different colorations to match the trees in their habitat.
Fill in the blank(s) with the appropriate word(s).
The polio vaccine currently administered in the U.S., known as IPV, is an example of a(n) ________ vaccine.
A. attenuated B. inactivated C. subunit D. toxoid E. recombinant