"Nerve net" describes the nervous system of:
a. flatworms
b. cnidarians
c. annelids
d. arthropods
e. sponges
b
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How are fossils older than 60,000 years dated?
a. directly dating the fossil with carbon 14 b. directly dating the fossil with uranium 238 c. dating rock formations below the fossil d. dating rock formations above the fossil e. dating rock formations above and below the fossil
Overspecialized adaptations
A) promote survival in a wide range of habitats. B) are the result of natural selection. C) are found only in species with very wide geographic ranges. D) enable a species to be more adaptable to environmental changes. E) enable a species to be more independent of other species.
Answer the following questions true (T) or false (F)
1. The tuberculin response is an example of allergic contact dermatitis. 2. Children with Bruton-type agammaglobulinemia are highly susceptible to recurrent bacterial infections. 3. Systemic lupus erythematosus (SLE) is a disease resulting from accumulation of immune complexes in various organs and tissues.
Your friend tells you that all dietary fat is bad for your health. Is this correct?
What will be an ideal response?