The large diversity of biological molecules depends on atoms of the element this element can make stable bonds to itself and to atoms of other elements. without this element, the large macromolecules that make up most of the molecules in living organisms would not be possible.
a. carbon
b. hydrogen
c. nitrogen
d. oxygen

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit