Coupled reactions are:
a. energetically favorable
b. brings energetically favorable and nonfavorable reactions together
c. needs the of enzymes in order to occur
d. none of these choices seem right
e. i think choices a to e seem to be correct

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs