Pathologists check lymph nodes near tumors for cancer because (select all correct choices):
A. lymphatic tissues are at high risk for
transforming into cancer cells.
B. lymph nodes near a tumor collect tumor
cells that have become metastatic.
C. malignant tumors preferentially invade
lymph nodes.
D. it is easier to detect cancer cells that are
formed in lymph nodes.
E. cancer cells will always turn a different
color in lymph nodes.
B
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Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator B. a single event like a hurricane C. random fluctuations in birth and death rates D. All of the answer choices are correct. E. the extinction of a prey species
Which of the following communication signals matches the animal?
a. chemical; honeybees b. tactile; frogs c. auditory; baboons d. visual; frogs e. chemical; fireflies
The organism in the above photograph has
which of the following structural systems? a. cartilaginous b. bone c. hydrostatic d. chitinous e. endoskeletal
If you focus on the data from the mid-1900s (indicated by the arrow) through today, the graph shows that
A) there is a correlation between CO2 and temperature; when CO2 levels are high, so is temperature. B) there is a correlation between CO2 and temperature; when CO2 levels are high, temperature is low. C) there is no correlation between CO2 and temperature; CO2 fluctuates randomly and temperature is constant. D) there is no correlation between CO2 and temperature; CO2 is constant and temperature fluctuates randomly.