Some tropical rain forests are the source of a plant that proved to be useful in fighting:
a. malaria
b. influenza
c. HIV
d. heart disease
e. cancer
e
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Why is energy lost when herbivores eat primary producers?
A) Primary producers have energy stored in indigestible substances. B) Primary producers cannot produce once eaten. C) Digestion takes place so rapidly that very little energy is absorbed. D) Most primary producers contain no usable energy for herbivores.
The dark middle layer of the eye that prevents
the scattering of light is the a. fovea. b. retina. c. sclera. d. choroid. e. cornea.
In which condition are both alleles expressed in the heterozygous phenotype?
A) pleiotropy B) codominance C) epistasis D) complete dominance
Which behavior is an example of a fixed action pattern?
A) the imprinting of baby goslings on their mother B) habituation in the cnidarian Hydra C) the way female digger wasps find their nests D) the way a greylag goose retrieves an egg that has rolled out of the nest