Most organisms benefit from trees because they produce what as a result of photosynthesis?
a. oxygen
b. carbon
c. nitrogen
d. carbon dioxide

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

What is a dendrite and what does it do?