Platelets are
A. produced by red blood cells.
B. cells.
C. involved in clotting of blood.
D. increase the permeability of capillaries.
C. involved in clotting of blood.
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Individuals with ____________________ are extremely sensitive to sunlight and develop skin cancer at a rate 1000 times above normal
Fill in the blank(s) with correct word
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane.
a. pellicle b. cilium c. capsule d. pilus e. flagellum
All of the following are true regarding coral reefs
EXCEPT that they a. develop in warm, clear waters near coasts or volcanic islands. b. are found between 25 degrees north and south. c. are wave-resistant formations. d. are areas of abundant resources and minimal competition among inhabitants. e. contain the remains of hard corals and the mineral-hardened cell walls of red algae.
Which of the following is probably a member of the Archaic humans, appearing around 600,000 years ago?
a. Au. sediba b. H. habilis c. H. erectus d. H. ergaster e. H. heidelbergensis