Secondary succession occurs more quickly than primary succession mainly because .

a. disturbances in the community exposes more soil
b. rocky areas contain more minerals
c. nitrogen-fixing bacteria are present
d. sunlight is more available
e. improved soil is present from the start

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

(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.