The number of hosts in the life cycle of a tapeworm is
A. one.
B. two.
C. three.
D. different for different types of tapeworms.
B. two.
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Which one of the following is believed to be the major event that led to the appearance of diverse, complex multicellular organisms on Earth?
A. the increase in atmospheric oxygen B. the appearance of animals C. the appearance of plants on land D. the appearance of bulk transport systems
A country's ecological footprint refers to the types of shoes it wears — a symbolic reference to how it balances environmental concerns with economic development
Indicate whether this statement is true or false.
With which of the following statements would a biologist be most inclined to agree?
A) Humans and other apes represent divergent lines of evolution from a common ancestor. B) Humans represent the pinnacle of evolution and have escaped from being affected by natural selection. C) Humans evolved from chimpanzees. D) Humans and other apes are the result of disruptive selection in a species of chimpanzee.
For water to leave a kidney tubule by osmosis, the interstitial fluid around that region of tubule must be ____ relative to the filtrate inside the tubule.
A. hypertonic B. hypotonic C. isotonic D. osmotic E. permeable