A very close association with two species is called:
a. adjoining.
b. symbiosis.
c. predator -prey.
d. host-fungus.
e. competition.
B
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Signal transduction pathways initiate activation of transcription after specific
A) TH cell death. B) ligand-receptor binding on the cell surface. C) cytokines diffuse across the cytoplasmic membrane. D) antigen-antibody binding.
How does DDT in the environment affect many birds?
A. stunted growth of chicks B. chronic liver failure in adults C. advancing neurological degeneration D. failed reproduction E. None of these choices are correct
Who developed the binomial system of nomenclature?
a. Charles Darwin b. Carolus Linnaeus c. Gregor Mendel d. Paul Hebert e. Ernst Haeckel
Which of the following cardiovascular diseases is caused by a narrowing of the arteries causing the heart to work harder when pumping?
A. heart attack B. hypertension C. stroke D. All of the answer choices are caused by a narrowing of the arteries.