Which of the following concepts best explains why an island can support many beetles but few hawks? A. the energy pyramid
B. the carbon cycle
C. the nitrogen cycle
D. the food web

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Onsider the paragraph above. what is one chemical property of water? a) water is a polar molecule. b) water is the universal solvent. c) water reacts with group 1 metals. d) water has a high specific heat capacity.

Nh3 +02-no + h20 is unbalanced what is the balanced equation