Which of the following about parasites is true?
A) They affect their hosts in a density-independent manner.
B) Their hosts represent a type of intraspecific competition.
C) They occur in animals but not plants.
D) They may live inside or outside of their host.
Question 2
The U.N. and many international agencies feel a sense of urgency to make the transition to renewable energies soon, because
A) of political pressure from China and the United States.
B) projected levels of carbon dioxide levels may reach 1000 ppm by 2100 with catastrophic effects of global sea levels and climate.
C) developing nations can afford renewable energy but not fossil fuels whose price is rising.
D) it will take some pressure off global fossil fuel reserves and keep electricity prices low.
Effects of introduced parasites on American chestnut trees.
True-color image of layers of haze in Titan's atmosphere.
True Forget-Me-Not
Adapoids and omomyoids had longer snouts and are the first “true” primates.
Midsagittal section indicating locations of true and false pelves
Anterosuperior view of true pelvis (blue)