The earliest fossils of archaic humans known to have produced tools are
A. Homo ergaster.
B. Homo erectus.
C. Proconsul.
D. Homo habilis.
E. Australopithecus.
Answer: E
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The above figure represents
a. membrane attack complex; pores in bacterial cell b. macrophage attack complex; fluids released from pores c. pores for mucus secretion ciliated lung tissue d. macrophages; muscle tissue e. none of these
The first active Drosophila segmentation genes are the ____, which begin organization of the body into regions
a. pair-rule genes b. segment polarity genes c. gap genes d. homeotic genes e. maternal effect genes
Who is at most risk to develop legionnaires' disease?
a. 65-year-old transplant recipient b. 14 year old swimming in a lake c. 90 year old living in an apartment complex d. Newborn baby to a mother infected with hepatitis
The loss of water from the surface of plants is
A. transpiration. B. dew. C. biomagnification. D. bioaccumulation.