Darwin's theory states, in part, that individuals with certain traits have an increased competitive edge. What is the source of these traits?
A. adaptation to stress
B. development over a lifetime
C. inheritance
D. mutation after birth
E. better living conditions
Answer: C
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Why can sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen. b. The malformed red blood cells cannot enter capillaries and, in fact, block them. c. The malformed blood cells assume a sickle-shape. d. The patient has two copies of the mutant gene. e. More cells assume the sickle shape as oxygen concentration in the tissues falls.
The tentacles of squids bear hooks, while those of octopus do not
Indicate whether the statement is true or false
On the illustration, "A" and "B" should be
labeled respectively a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. consumers; decomposers
Against what protein is the treatment for metastatic colon cancer Vectibix directed?
a) p53 b) VEGF c) pRB d) Her2 e) the EGF receptor