Diatoms, like most phytoplankton, are much more abundant in the photic zone than in the aphotic zone. Which two factors found in the photic zone are the most essential for phytoplankton?

How does an angiosperm prevent self pollination

Acommon kind of mechanical weathering is called

(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.