An important example of a "positive feedback loop" in the polar climate system is:
a. Scientists in remote places check on each others instruments.
b. Warming ocean water opens new areas for marine species.
c. Warmer winters cause more plant growth, providing more food.
d. Sea ice melt opens more ocean to sunlight, causing more melt.

Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Explain why phospholipid molecules form a bilayer. (3 marks)