The European Neanderthals were replaced about 34,000 years ago by

A. Homo erectus.
B. Homo habilis.
C. Homo heidelbergensis.
D. Cro-Magnons.
E. Neanderthals.


Answer: D

Biology & Microbiology

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Upon establishment of germs as the cause of infectious diseases, scientists advocated the destruction of these microbes by exploiting the difference in nature of these germs and the host. This may be achieved by having agents acting only on the germs and not the host or what is known as "selective toxicity". The latter term was coined by

A. Louis Pasteur B. Robert Koch C. Joseph Lister D. Paul Ehrlich E. Alexander Fleming

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A) Stalks of celery are the petioles of the plant. B) White potatoes are modified plant roots. C) A carrot is an example of a taproot. D) The layers of an onion are actually modified leaves.

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Behavior modification is a technique used in psychological therapy to promote desirable changes in behavior.

a. true b. false

Biology & Microbiology